slender plover
I've seen this mod around for a bit, but it's for 1.17, and I play on 1.19.3.
This mod just previews the world creation while Minecraft generates a new world, so you can see how it's loads!
Here's the mod link if anyone is interested in porting this mod to 1.19.3: https://modrinth.com/mod/worldpreview/gallery
vague vault
the mod is mainly meant for speedrunning but this dev has gone inactive
It's undergoing a rewrite for 1.16.1 because it has some issues, and after that it will probably be ported to other commonly used speedrunning versions (1.16.5, 1.15.2, 1.14.4, 1.8.9, 1.7.10, 1.17.1, 1.18.2)
So 1.19+ ports probably won't be seen from speedrunning community devs for a while