You can recreate this issue by having an avatar, and adding physbones over the quest limit of 8 physbone components or 64 physbone transforms. Switch your build to Android, and the SDK will still allow you to upload the avatar. In-game, the avatar will have 0 physics.

The avatar SDK used to prevent upload of quest avatars that went over the physbone limit, this was useful to prevent mistakes during quest conversions. Please make the avatar SDK prevent uploads of quest avatars over the physbone limit again. The SDK I am using is 3.8.0