(Bi/tri)linear texture filter treats the bottom pixel line of weapon sprite as transparent, though graphic editors reveal that it is not, and this doesn't happen without texture filtering.
So one has to play either with no texture filtering and jagged graphics, or cope with bright environment graphics and effects flashing through the weapon.
The screens were made when standing on pentagrams in Doom Slayer Chronicles https://www.moddb.com/mods/doom-slayer-chronicles