Found an error with giant purple dragon (Ragia) :
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ERROR in
action number 1
of Other Event: <unknown>
for object obj_enemy_testroom:
Unable to find any instance for object index '86' name 'obj_viewer'
at gml_Object_obj_enemy_testroom_Other_59
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gml_Object_obj_enemy_testroom_Other_59 (line -1)
Seems somethings up with his swallow animation in the gallery when it plays one time.