In an avatars scene if you enable & use a camera to upload a new avatar thumbnail, select a different GameObject, then disable the camera, and save the scene, Unity will crash.
Scene setup:
  • Add a camera to your scene to use for the camera
  • Disable the camera by default (Unsure if required?)
  • Save scene.
Repro:
  • Enable the camera Gameobject
  • Upload a new thumbnail for an avatar in this scene using it
  • Select GameObject other than the camera (??)
  • Disable camera GameObject
  • Save scene
Video: