ZDoom

This is an interesting situation. The new behavior mirrors that of the software renderer.
However, since in this case that is a broken undefined and useless special case I changed it so that for wrapped mid textures the sky special handling is simply completely disabled. That clips the texture segment to the actual sector bounds but does not reintroduce the bug this change was supposed to fix.

https://www.doomworld.com/idgames/level ... m-o/ma_wrp

this is the map in the other screen-shot. There's another instance in sector 9103 (technically, it's 10,020 in the skybox sector)

Yeah, that's a bug. I tried entering the following into compatibility.txt: but it didn't work.

https://www.doomworld.com/idgames/level ... m-o/ma_put

right as you walk into the first room, turn around and it's where the screen-shot was taken.

What map is this so we can check it out?

Somewhere in one of the recent builds, it appears that mid-textures with the 'wrap mid texture' flag will no longer be clipped by ceiling if it's a sky texture. I'm not sure if this is intentional or not, but regardless, here are some screen-shots demonstrating this where they have looked otherwise normal in all previous releases.

https://imgur.com/a/QltPYdR