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BSP sections disappear

I have a BSP room, a BSP hollow cone, and a BSP hollow cylinder with half its faces deleted. When working with that cylinder, something wonky happened. Here is a picture of my parts before the cylinder is included (or when it is cut from the scene):

screenshot of cone and cube-based room doing fine without the cylinder

And here after adding the cylinder:

screenshot of cone and cube-based room with the cylinder, with the cone missing its bottom half and the room missing its floor and a wall

When the cylinder is in the scene, the cone loses its bottom half and the room's floor (and a wall, barely seen at this angle) disappear. I also had issues earlier where I could not add another cube to my room; inside the room's cube, it would disappear. Any thoughts why?

Just in case, I have copied and pasted, restarted the editor and the computer, tried in a new level, and (with regard to the cube mentioned in the last bit) triple checked additive versus subtractive.

Product Version: UE 4.18
before-cylinder.png (755.8 kB)
after-cylinder.png (814.8 kB)
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asked Feb 02 '18 at 02:59 AM in Rendering

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