It became aware to me when you save a part to ROBLOX then henceforward place it into your game, the model’s " forgets " the Surfaceinputs and ConstraintDetails.
The model on the left is created in-game, the model on the right is the same model but saved to Roblox and placed in-game.
Now watch what happens;
Steps to reproduce;
Create a model wherein there are Surfaceinputs and or Constraintdetails. Save the model to ROBLOX and re-insert it into the studio.
This happens for me 100% of the time. I’ve opened ROBLOX on Chrome
The bug has been occurring for as long as I can remember.