I just reloaded the project and the ghost collider was no longer there, so I repeated the steps mentioned in my previous reply and was able to reproduce.
- Drag BSP Sphere to scene, then
delete it. - (Optional) Build, Close/Reopen Editor
-
show collision
in Play mode.
It might be worth mentioning that I have the Substance plugin installed.
Project: [TPS2.][1]
[Show Full Size][2]