I'm new to godot but I also ran into some slight trouble when exporting for web. It was warning that I needed to turn on a setting in the project settings. After that the web export worked ok for me.
I didn't get a chance to look into executable exports unfortunately. Hope this helps
I also had probmes with exporting for godot (v3.2.1) I had to include some import files. By trial and error I found out that *.import files were needed and also .import folder. I don't know why. I have exported 2 games before with same settings in older version of godot without issues. Maybe bug?
