Version Information

Minecraft 1.21.1
NeoForge: neoforge-21.1.68-installer.jar
Lithium: lithium-neoforge-0.14.0-snapshot+mc1.21.1-build.88.jar

Expected Behavior

In the EvilCraft after kill mob under some conditions spawned a new "ghost" mob that is invisible and untouchable until get some magic ring.

Actual Behavior

"ghost" mob blocks movement of player

Reproduction Steps

1. Install Evilcraft + Cyclops core
2. In creative mode make long narrow horizontal corridor
3. Get zombie spawn egg, Vengeance pickaxe, some sword
4. Switch to survive mode
5. Break some stone with Vengeance pickaxe (1 stone block is enough)
6. Spawn a zombie
7. Kill zombie
8. Try move along the corridor - invisible spirit of zombie will block movement

Other Information

cyclopscore-1.21.1-neoforge-1.25.2-634.jar
EvilCraft-1.21.1-neoforge-1.2.59.jar

Related bug in EvilCraft:
CyclopsMC/EvilCraft#1070

I think I found the reason for this issue. The code looks like lithium also allows all mobs to collide with dead shulkers incorrectly in some conditions. Confirmed it with the auto-jump functionality, which causes the player to jump onto dead shulkers with the latest lithium release

Please test the following workaround and report back:
Add mixin.entity.collisions.intersection=false to the lithium properties file in the config folder and restart the game.

Yes, no more collisions

Confirmed that property fixes the issue. Ghost entities are still there but no longer cause collisions.

Thanks, the fix will be included in the next release