When making a fixed joint, connecting to nothing and making drag and angular drag infinity so it stays still and essentially becomes a world space game object it malfunctions.
it does not do this anymore
I have tried many tests and the only result is when your avatar/client root is moved in the world scene it will start to follow you as if the fixed joint is no longer attached.
Video is the exact problem, Although when you SIT STILL it will snap back into the original place it was dropped.
only one avatar of mine has not suffered from this, it is a humanoid rig that I drop and is being fully animated and dancing
I have tried to replicate it but i can not get the same results,
the world object that im dropping with the animation is a 5.6 avatar that works fine, although i have avatars from 5.6 that use the same method and dont work.