The new renderer has some issues with a few Doom models: Torches and translucent items.
The tall torches throw strange patterns on the close walls and ceilings. It's probably the flame which cast shadows.
The flames of Lost Soul and short and tall torches loose their translucency. Spheres (Soul, Mega, Invis, Invuln) are still translucent but their "faces" have turned invisible. If player picks up the light amp. goggles those items get back translucent as long as the goggles last.
The torch flame's inside part is translucent but it's unlightened and dark.
(Some screen shots, Doom2 MAP11 has a good selection of torches.)