I’m kinda new to this (devforum posting), but i just wanted to talk about this since i haven’t seen anyone mention it despite this problem occurring for months or longer.
Basically, if you delete something in studio (for example, a part), theres a VERY rare chance that it never comes back even if you try to undo it. I have no idea what’s causing this, but I know that it’s extremely rare but kinda devastating whenever it happens. I am aware that there are ways to restore versions of your game, and yes that is a solution to this bug if it ever happens to you. Unfortunately this time around, I didn’t have a good copy of the game, but the damage thankfully wasn’t too bad.
This bug has the potential to permanently destroy parts of your game if you don’t have a backup, and it’s pretty annoying.