ZDoom

actor bluh:techlamp{
     +wallsprite
}

They never worked in software. Here's a minimal example, i've tried 3.1.0a and they were broken. Graf fixed the crash then and it came back later.
https://forum.zdoom.org/viewtopic.php?f=7&t=56537
DECORATE version:
[code]actor bluh:techlamp{
+wallsprite
}[/code]

But did they work in ZDoom? Is there a simple test wad out there?

LZDoom was not affected by the crash but it's affected by this bug. The legacy branch still crashes after the fix. Edit: and master.

https://www.dropbox.com/s/tbyujjqpw2sj5q3/navy3d.ipk3?dl=0

I'll work on getting some sort of minimal example ready so you don't have to constantly download a huge 47MB file. This was discovered during the development of a project of mine which makes extensive use of wall sprites.

Discovered while fixing [url=https://forum.zdoom.org/viewtopic.php?f=56&t=65391&p=1120448]this bug[/url].

Same file sample.

While sampling Y-data seems to work just fine, sampling X data does not. It always samples one column of the sprite (the center?).

Furthermore, the texture resize system seems to bork it even further.