As recommended by the log instructions, I am opening an issue.

Godot Engine v3.5.1.stable.custom_build.f33cc8c85 - https://godotengine.org

OpenGL ES 3.0 Renderer: NVIDIA GeForce RTX 3080/PCIe/SSE2

Async. shader compilation: ON (full native support)

Shader cache: ON

ERROR: This FBX has a material with mapping name: ShininessExponent which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:163) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: This FBX has a material with mapping name: SpecularFactor which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:163) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

Invalid material settings change to Ai Standard Surface shader, mat name: Viper_MAT

ERROR: The FBX texture, with name: `Viper_C.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Viper_C_alpa.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Viper_N.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: Condition "_first != nullptr" is true.

   at: SelfList<class DynamicFont>::List::~List (.\core/self_list.h:108) - Condition "_first != nullptr" is true.

WARNING: ObjectDB instances leaked at exit (run with --verbose for details).

   at: ObjectDB::cleanup (core\object.cpp:2070) - ObjectDB instances leaked at exit (run with --verbose for details).

ERROR: Resources still in use at exit (run with --verbose for details).

   at: ResourceCache::clear (core\resource.cpp:417) - Resources still in use at exit (run with --verbose for details).

ERROR: There are still MemoryPool allocs in use at exit!

   at: MemoryPool::cleanup (core\pool_vector.cpp:63) - Condition "allocs_used > 0" is true.

Another error, but this time with a FBX I made myself

Invalid material settings change to Ai Standard Surface shader, mat name: Pod_Collector01_MatInst

ERROR: The FBX texture, with name: `Pod_Collector01_Diff.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector01_Norm.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector01_Msk3.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

Invalid material settings change to Ai Standard Surface shader, mat name: Pod_Collector_Glass01_Mat

ERROR: The FBX texture, with name: `Pod_Collector_Glass_Diff.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector_Glass_Normal.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

Invalid material settings change to Ai Standard Surface shader, mat name: Pod_Collector01_MatInst

ERROR: The FBX texture, with name: `Pod_Collector01_Diff.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector01_Norm.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector01_Msk3.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

Invalid material settings change to Ai Standard Surface shader, mat name: Pod_Collector_Glass01_Mat

ERROR: The FBX texture, with name: `Pod_Collector_Glass_Diff.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Pod_Collector_Glass_Normal.png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:542) - Condition "true" is true. Continuing.

ERROR: Condition "_first != nullptr" is true.

   at: SelfList<class DynamicFont>::List::~List (.\core/self_list.h:108) - Condition "_first != nullptr" is true.

WARNING: ObjectDB instances leaked at exit (run with --verbose for details).

   at: ObjectDB::cleanup (core\object.cpp:2070) - ObjectDB instances leaked at exit (run with --verbose for details).

ERROR: Resources still in use at exit (run with --verbose for details).

   at: ResourceCache::clear (core\resource.cpp:417) - Resources still in use at exit (run with --verbose for details).

ERROR: There are still MemoryPool allocs in use at exit!

   at: MemoryPool::cleanup (core\pool_vector.cpp:63) - Condition "allocs_used > 0" is true.

Another log issue:

Godot Engine v3.5.1.stable.custom_build.63eecdd5e - https://godotengine.org

OpenGL ES 3.0 Renderer: NVIDIA GeForce RTX 3080/PCIe/SSE2

Async. shader compilation: ON (full native support)

Shader cache: ON

WARNING: We don't officially support Blender FBX animations yet, due to issues with upstream Blender,

so please wait for us to work around remaining issues. We will continue to import the file but it may be broken.

For minimal breakage, please export FBX from Blender with -Z forward, and Y up.

   at: EditorSceneImporterFBX::import_scene (modules\fbx\editor_scene_importer_fbx.cpp:172) - We don't officially support Blender FBX animations yet, due to issues with upstream Blender,

so please wait for us to work around remaining issues. We will continue to import the file but it may be broken.

For minimal breakage, please export FBX from Blender with -Z forward, and Y up.

ERROR: This FBX has a material with mapping name: ReflectionFactor which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: This FBX has a material with mapping name: ShininessExponent which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: The FBX texture, with name: `gobbos (1).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `gobbos (2).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: This FBX has a material with mapping name: ReflectionFactor which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: This FBX has a material with mapping name: ShininessExponent which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: The FBX texture, with name: `Broze top (2).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Broze top (4).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

WARNING: Octahedral compression cannot be used to compress a zero-length vector, please use normalized normal values or disable octahedral compression

   at: VisualServer::norm_to_oct (servers\visual_server.cpp:346) - Octahedral compression cannot be used to compress a zero-length vector, please use normalized normal values or disable octahedral compression

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_baseColor.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '0' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_baseColor.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '0' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_baseColor.png. Skipping it.

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_metallicRoughness.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '1' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_metallicRoughness.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '1' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_metallicRoughness.png. Skipping it.

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_normal.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '2' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_normal.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '2' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_normal.png. Skipping it.

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_baseColor.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '3' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_baseColor.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '3' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_baseColor.png. Skipping it.

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_metallicRoughness.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '4' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_metallicRoughness.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '4' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_metallicRoughness.png. Skipping it.

ERROR: No loader found for resource: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_normal.png.

   at: ResourceLoader::_load (core\io\resource_loader.cpp:278) - Method failed. Returning: RES()

WARNING: glTF: Image index '5' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_normal.png. Skipping it.

   at: GLTFDocument::_parse_images (modules\gltf\gltf_document.cpp:3096) - glTF: Image index '5' couldn't be loaded from URI: C:/Users/dgali/Downloads/spiderman-green-goblin-pumpkin-bomb/GLTF/textures/Bronze_top_normal.png. Skipping it.

WARNING: We don't officially support Blender FBX animations yet, due to issues with upstream Blender,

so please wait for us to work around remaining issues. We will continue to import the file but it may be broken.

For minimal breakage, please export FBX from Blender with -Z forward, and Y up.

   at: EditorSceneImporterFBX::import_scene (modules\fbx\editor_scene_importer_fbx.cpp:172) - We don't officially support Blender FBX animations yet, due to issues with upstream Blender,

so please wait for us to work around remaining issues. We will continue to import the file but it may be broken.

For minimal breakage, please export FBX from Blender with -Z forward, and Y up.

ERROR: This FBX has a material with mapping name: ReflectionFactor which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: This FBX has a material with mapping name: ShininessExponent which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: The FBX texture, with name: `gobbos (1).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `gobbos (2).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: This FBX has a material with mapping name: ReflectionFactor which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: This FBX has a material with mapping name: ShininessExponent which is not yet supported by this importer. Consider open an issue so we can support it.

   at: FBXMaterial::extract_material_info (modules\fbx\data\fbx_material.cpp:164) - Condition "fbx_texture_mapping_desc.count(fbx_mapping_name) <= 0" is true. Continuing.

ERROR: The FBX texture, with name: `Broze top (2).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.

ERROR: The FBX texture, with name: `Broze top (4).png`, is not found into the project nor is stored as embedded file. Make sure to insert the texture as embedded file or into the project, then reimport.

   at: FBXMaterial::import_material (modules\fbx\data\fbx_material.cpp:544) - Condition "true" is true. Continuing.