An FPS multiplayer template for Godot so you don't have to start from scratch
when first load from asset storage. It seems that you are using an extension for .blend files. Not everyone knows about its existence, let alone uses it, just like Blender itself. I think you should export your models to .glb.  
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be resolved. The issue was opened by KeiMuriKoe and has received 3 comments.