Wonky nether surrounded by walls.

Hey guys!

I was playing Minecraft: Java edition on version 1.18 Pre-release 7, whereupon entering the nether dimension I stumbled across a fairly weird bug, in which the nether consisted of almost exclusively walls. Pretty hard to explain. 

Upon flying a bit further away, there were countless lava-pools stretching 1,5k-3k blocks.

I included a couple of screenshots to better explain the situation, as well as a screenshot with the F3 menu open - there you can see my system's specs. 

Cheers!