Wad is Refracted Reality, Map 11
Mod is DAKKA
The splash decal was from rocket launcher.
Now I remember it happening a few times in other places different wads.
The renderers used are shown in the video.
Hardware renderers - shows all decals, they get cut off when get close, some decals disappear when approached
Software renderers - decals ALWAYS get cut off, and the decals that show but disappear depending on the distance do not show AT ALL in software.
I tried changing various settings including texture, lightmodes and various hardware rendering settings, none had any effect on the matter.
I think it has something to do when one decal is applied to 2 connected linedefs, like it's on a corner or something along those lines.
Upon inspection of the area it seems that the column in question consists of 2 sectors, the upper sector being less than a unit away from lower, so it's dechnically 2 walls. The decal applies to both when looked from distance, but disappears from lower wall when approached.
Here's INI and save file https://www.pastefile.com/RfSoxo