Not all custom collisions are importing

Hi, I’m trying to import a room from a Blender FBX with custom collisions. Everything is either box or convex (UBX or UCX), however it wont import all of the collisions. I can’t seem to figure out how it’s determining what to leave out.

I’ll include one of the offending FBXs.
DecontaminationChamber.fbx (116.5 KB)