Exactly what the title says. If a mob attacks a Slime or Magma Cube, the Slime or Magma Cube will just ignore that mob and just let itself get killed.
How to replicate:
Spawn a Slime or Magma Cube (duh)
Give it the Resistance 5 effect
Spawn a Zoglin, and wait for it to go after the Slime or Magma Cube
Expected results:
The Slime or Magma Cube ignores the Zoglin initially, but fights back once attacked.
Actual Result:
The Slime or Magma Cube continues ignoring the Zoglin when attacked, and just lets itself get hit over and over
Just spent half an hour testing, it seems to be an issue with ANY mob that can provoke another mob without some sort of external modification. The mobs I tested are as follows:
Llama, Pufferfish, Skeleton, Stray, Drowned with Trident, Witch, Piglin with Crossbow, Warden, Blaze, Ghast, Shulker, Johnny Vindicator, Evoker, Pillager, Breeze, and Bogged. Neither Slimes nor Magma Cubes retaliated against ANY of these mobs.