The golden dandelion can work on tamed baby skeleton horses and zombie horses (through commands), this is inconsistent with untamed undead horses, and with other monsters. The entity tag “cannot_be_age_locked“ only has camel husks and hoglins, not the undead horses.
Steps to reproduce the issue:
Summon a tamed zombie horse or skeleton horse
/summon zombie_horse ~ ~ ~ {Age:-24000,Tame:1} or /summon skeleton_horse ~ ~ ~ {Age:-24000,Tame:1}
Expected result:
The golden dandelion should not work on them.
Actual result:
It does work, only when tamed that is.
Reproduced in on 26.1-snapshot-5.
Zombie horses aren’t supposed to grow at all though based off this: