So, walrus bug was caused by mob_core errors… ElCeejo updated mob_core, and its fixed now
also, the zombie bug was fixed… it was a compatability issue with magma_conduits. The setting remove_default_lava must be false to work with zombies. Thx, @Knot Abbot on Discord
So, Now you can try to fight zombies! they are quite different from their counterparts from mobs_redo… it takes some skill to kill them, and
more will be attracted by the sounds of fighting.