All zombies have a black cube for a head, I have seen normal and desert zombies like that, zombie villagers are fine.
Environment
I have Ubuntu 19.04 with
openjdk 11.0.4 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11-post-Ubuntu-1ubuntu219.04)
OpenJDK 64-Bit Server VM (build 11.0.4+11-post-Ubuntu-1ubuntu219.04, mixed mode, sharing)
I use MultiMC
Linked issues
Attachments
Comments 2
Duplicates MC-163008.
skeletons and creepers also look fine