Godot4.4 issues are outside the scope of this project. This template was built for 4.3. It should work in 4.4, but if it doesn’t, it’s likely this is a 4.4 issue, not a GodotBoyTemplete issue. Read their docs for more. Try deleting your .godot folder first though. That forces projects to reimport assets and sometimes fixes issues.
The template here was behind the Git repo a bit. Looks like there are some old bugs with the export that were fixed on the main branch. I updated the build here. Try your export again.