susanshopper

What permaloader type are you talking about? Is it the beacon permaloader which uses sticky pistons with slime blocks that push and pull stained glass to cause beacon updates?

Somewhere in the code, when optimizedTileEntities=true, it disables the code that makes ender chests load chunks. May you please take a look at TileEntityEnderChest.java.patch(the carpet patch) and minecraft/net/minecraft/tileentity/TileEntityEnderChest.java(Vanilla code)?

A potential fix: With this fix, if optimizedTileEntities is True, the ender chest’s chunk loading mechanic only deactivates in a player loaded area or the spawn chunks. It can also...

The MC-125638 fix can be backported from Vanilla 1.15 pre4, and the MC-167047 fix can be backported from Vanilla 1.16 pre1. If that does not work, then may you please...