Missing triangles in BSP geometry after building (Linux)

[rflori]

Hi ,
of course I can. It’s actually very simple to produce something like that:

1. Create a new default level
2. Add a spiral stair brush
3. Add a cube brush which intersects the stairs
4. Add a cylinder brush and make it hollow
5. Add a box brush and subtract it from the hollow cylinder
   6. Press ‘Build’ (before building everything looks fine)

I added some pictures for the results after steps 2, 3 and 5.