Mango found out that the End was loaded with nobody in it and later it was found out that the Frosted Ice loads Chunks in the End without anybody near it.

Ugh so they didn't fully fix the issue?

I don't know what do you mean but.

We've tried it with Lithium on a brand new Server: Stays End Loads
Without: Nothing

Oh, this is caused by lithium?

A user sent me this worlddownload ( i removed all but the end dimension). How to reproduce: Enter the end, leave the end (through end portal, not sure if relevant). Then profile the game, e.g. using /debug start and /debug stop a few seconds later.

The results in vanilla are that the end is barely taking and CPU time, while with lithium it takes a lot of CPU time

Peaceful.zip

I'm marking this as critical due to the risk the bug here offers for a denial-of-service attack against servers running Lithium.

Workaround for now is adding mixin.world.tick_scheduler=false to the lithium properties file

This is likely caused by an off-by-one error at the bottom of the world. All scheduled ticks at y0 are not saved/removed from the world in the releases before 0.6.2

No longer reproducible with commit d9ff49b