Reloaded my 1.17 homeworld seed and discovered mud very close by but it didn't register at the top of the screen with WTHIT. This is the only bug that I've seen so far because it worked just fine when looking at the newly added mobs nearby but I was unsure of who to post the bug to so here I am. Hope this helps! ^_^

https://www.curseforge.com/minecraft/mc-mods/wthit