I have encounterd the issue in the last couple of days with Roblox’s new update, which is completely stupid for the following reason:
There was a Triangle Limit added of 2500, which makes it impossible to make CSG Vehicles like Busses or Trams.
Previous Unions made before the update are not able to be seperated apart, either you encounter a error or it just seprates the same part 100’s of times.
Previous Unions made before the update are not compatible to be unioned again, or be edited with a Negated Part.
Personally, I find this update destroys Roblox’s CSG engine and I hope that they revert it soon.
no, changing your CSG version to v2 (CSG Legacy Version) does not help the bugs, I already tested it.
I haven’t used CSG since version 1 years ago. Mesh is the way forward, CSG just isn’t it. If anything, use CSG and then export it as a mesh then import it as a MeshPart
Thinking about how Roblox makes Studio worse every update is wonderful (irony). They brick everything and you have to wait upto 3 months for it to be fixed, excample where they bricked the function to get archived games back which was fixed now, but you needed to use a work-around to get things from your archived games backthen.