A tried to add support to Greater prairie chicken from from Unnamedanimalmod, but when chicken tried lay the egg in nest, minecraft crashed
crash.txt
Datapack.zip

Your loot table is a. csv file it should be .json

Also use a different namespace than husbandry. (using husbandry will overwrite the existing ones for the vanilla animals)

I will make the game not crash though in the future and put a warning that it couldn't find the loot table instead.