Repro: Union two parts. Put them in game.ReplicatedStorage (Filtering on, idk if that matters), set CollisionFidelity to ‘Box’ then have a client localscript clone the union into workspace. Go into explorer and it’s reverted from any CollisionFidelity to Default.
No idea. This is just something I noticed in my game. I turned on CompositionGeometry to try and see if the bug is just a problem with the property showing (the Fidelity would be fine) but it won’t even show the composition. Also as you can see it’s reset back to ‘Default’ again. They had been set to ‘Box’ before I started the test. They were changed by the bug.
FYI here’s the same unions/meshes just parented to workspace before I click start. They aren’t corrupt, it’s just the clients cloning them that does something funky.
Insert UnionOperation/MeshPart (I only tested this with a MeshPart) to somewhere like ReplicatedStorage with a CollisionFidelity of Box
Clone said part to workspace
Part will say “Default” on CollisionFidelity
Also, I noticed this only happens in Start Server/Start Player which I use primarily, but is fixed in Play Solo which is why I didn’t realise it had been fixed (for Play Solo and possibly normal servers(?))