"Holes" in floor/ceiling around key cards in Ultimate Doom

[lemming]

On the latest dev build (gzdoom-x64-g4.11pre-203-gc6978c23a as of this writing), there is a rendering glitch that shows up on E1M9 and E1M6 in Ultimate Doom when using the hardware renderer. It manifests as a "hole" in the floor and ceiling around a key card. This does not occur in the software renderer.

I have not bisected to find the offending commit, but this appears to have been a regression introduced after the 4.10.0 release.

Here's E1M9, coordinates are included in the screenshot:
https://i.imgur.com/CULdKQJ.png

And E1M6:
https://i.imgur.com/aB0vJnO.png

[Graf Zahl]

This was fixed already