Issues with Blender integration

We had a problem with models dissapearing in builds due to Blender version differences so everyone in the office had to update to Blender 2.8. But when I updated, something in the integration broke and now for a specific project, I can't see the models in the scene or in runtime.

The integration works perfectly fine for other projects running the same version of Blender (2.80) and Unity (2019.10f2). It also works fine on this specific project on other computers, the only difference being that they use Mac and I use Windows.

I replaced the Unity-BlenderToFBX.py file according to some tips I found on Google and while that stopped a lot of the errors which told me that I was using an older version of Blender when I wasn't but it still doesn't work.

The only error I get now is when I launch the project:
Failed to load component (MonoBehaviour)! Removing it!

But the thing is my coworkers also get the same error, and things work just fine.

Any ideas on how I can fix the problem?