When I click 'MODS' to open Modmenu I get an immediate 'Saving world...' and crash. This only occurs after 10ish minutes in the world.

I get this error from a few of your mods (zoomify, debugify, and cull-less-leaves):

[22:06:47] [Render thread/ERROR]: Error from mod 'zoomify'
java.lang.IncompatibleClassChangeError: Found interface dev.isxander.yacl.api.YetAnotherConfigLib$Builder, but class was expected

As well as an error from You're in Grave Danger:

[22:06:47] [Render thread/ERROR]: Error from mod 'yigd'
java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 129

Which seems to be the error actually causing the crash, but wanted to raise the issue here too in case it's an incompatibility.
latest.log

You need to downgrade to YetAnotherConfigLib 1.x