Zombies and Piglins ignore Baby and Age options

Summary

Zombies and Piglins cant be set to adults or babies only.

Steps to reproduce

1. Create a mob config
2. Set the mob to piglin or zombie
3. Set the Baby option to true/false
4. Spawn the mob using the /mm m spawn command

https://pastebin.com/VShKKJnk

Current behavior

The zombie/piglin spawns with a random baby/adult state.

Intended correct behavior

The zombie/piglin should always spawn as a baby when the Baby option is set to true, or always as an adult when Baby option is set to false.

Server log file

https://pastebin.com/nT31spTy

Debug log snippet

https://pastebin.com/gHcdmSVN

Proposed fixes

Something wrong with the NMS code, im not sure if this bug appears on 1.15 or below i've only tested it on 1.16.3.