On certain wals there seem to appear those tiny sparklies that run along the upper/lower end of the textures. I have applied a screenshot of Memento Mori's map 10. It also happens in a bunch of other custom maps, including one that I'm tinkering with.
It happens on random walls, no matter if the texture is dark/light. And it seems not to happen at all in the original maps. Even if it does, the sparklies are SO tiny, you need a magnifying glass.
Sloppy nodebuilding or Zdoom's fault?
[Won't fix] "Sparklies"
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This is not a node problem. It's just caused because of the imprecision of computer math. The edge of the wall is calculated separately from the texture drawn on it. The "sparklies" are actually the texture repeating because a pixel or two more was drawn for the height of the wall than was textured. Don't expect me to work around this any time soon.