Mods installed:

- Waila
- Cavern
- JEI

When looking at a block with WAILA on, the cavern worlds render strangely. This only happens in the Caveland dimension and not the overworld.

(https://gfycat.com/HelplessPassionateArchaeopteryx)

I got the same problem, assumed it was either better foliage or optifine though. I do have The One Probe installed, which is similar to Waila. There's another rendering glitch I get in the cavern dimension... when I have my shield up while a skeleton is attacking, if there is any Magnite ore in the background, the ore blocks turn completely red. I'll get a pic of the second one when I get a chance, as it's tricky to take screenshots while being attacked. https://ibb.co/nedoGQ