How to reproduce: create a hole by digging 2 blocks, then spawn baby zoglins.
What just happened: The baby zoglins get killed instantly when spawning them.
Haven't tested yet on other baby mobs, i'll update it if this bug also happens to other baby mobs.
Also ignore why the zoglins have red blood, the resource packs havent got his bug to happen.
Also This issue is probably invalid.
Hello!
This appears to be working as intended. This feature is called entity cramming, where if a certain amount of entities are in one place (24 by default) that will kill off the other mobs to help prevent lag, though you can change that gamerule.