Minecraft v1.21.1
Mod Litematica v0.19.50 and Malilib v0.21.0

When I turn on the material list HUD, as you can see on the right-corner it works in this UI, but as soon as I close the litematica menu it turns into this...

Probably it's from the other (Main house & Farm) loaded schematic, but I'm 3000 blocks away (travel through nether).

This bug appear when I activate the material list HUD -> travel to nether -> out to overworld -> click refresh in the material list menu.

The only thing to get rid off for now is to rejoin the world.

The way the material list refresh happens has always been pretty janky and it needs to be re-worked at some point. You can remove the pending count tasks via M -> Task Manager.

@maruohon Yeah sadly will do that workaround for now.