Potential solution was:
Kill all hens that came from a previous version of the game. Other animals from previous versions can be ignored.
Spawn in new hens using creative mode.
/gamemode 2
Set new hens to gen 10 using
/entity cmd l[] setgen 10
to set the generation of the creature you're looking at to 10.
Close and reopen the game.
Maybe. That's a rough approximation of what happened before things started working.
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