This one's a bit weird since I don't really know what happened, so i'd recommend just looking at the crash log lol. But basically i've played on this world for a bit now to test how well my custom modpack works. It works quite fine with a few unrelated issues.

One of the issues i'm having though is that the cave biome maps load / look for biomes indefinitely in survival. (one of them did work for Primordial Caves but the map generated did not show the actual caves in the map for some reason??) However if i switch over to creative and load it, eventually it does load the map properly. (there's a little more to it like sometimes after switching back to survival or reloading the world makes the map go back to loading infinitely)

So anyways, what I remember doing last is installing the https://legacy.curseforge.com/minecraft/mc-mods/extrasounds-forge and uninstalling some other mod that was probably not important. (I think it was nullscape or something)

I also had this cave map in my inventory that I was planning to go to. (Generated in creative of course.)

I loaded into the world, the extra sounds mod seemed to be working but when i scrolled over to the cave biome map in my hotbar the game froze and crashed.

I then messed around to try to fix this like using NBTExplorer to delete the cave map off my inventory, disabling Alex's Caves, reloading into the world (which did work but crashed again when loading back in the world with Alex's Caves re-enabled.) but didn't seem to work.
I really don't wanna lose this world :(
Also this is kinda my first big issue here so idk how github works lmao

crash-2023-12-10_17.30.46-client.txt