Good observation.
What’s going on here is not really anything new with this beta, it’s something that you always have to be aware of when using the CSG system. But it’s also possibly something you’ll have to be a bit more aware of if you’re scaling things in a significantly non-uniform way:
- The collision geometry of a CSG part does not change when you scale it, it just gets scaled.
- “Default” collision fidelity is scale-sensitive, it uses a uniform grid system to determine the physics decomposition.
Putting these two facts together, you’ll have to make sure that if you’re using Default collision fidelity, you create your CSG at a large enough scale that any holes you care about don’t get “filled in” by the Default decomposition algorithm, because they’ll still be filled in when you scale up the part, the decomposition won’t be recomputed.
Aside: I would highly recommend using PreciseConvexDecomposition for the majority of your CSG parts. The main case where Precise causes issues is with MeshParts that have complex curved surfaces, but the majority of CSG parts are better served by Precise (or Hull / Box for things you don’t need detailed collisions on)