If you play the Unholy Catacombs incursion and place a Fissure of Embermount close to the walls, it will try to adjust to it and sometimes glitch heavily or z-fighting can also occur. The texture from Fissure should also not be placed on walls. This does not look beautifull and the world of DD2 is a beautyfull looking one.
steps to reproduce:
No visual glitches on the Fissure of Embermount near walls.