Need a block reset and maybe entity re-pop at -308, 72, -566.
While waiting for the iron farm to do its thing, I decided to take a crack at the malfunctioning cow grinder there. I failed.

The grinder doesn't really work because the adult cows are now 1.5 blocks tall with child cows being somewhere less than 1 block. Also, the piston there used to push them into the ceiling doesn't work, as they just warp through the piston's platform and get pushed out.
I'll try making a version of it on my offline lab and see if I can come up with a version using a sticky piston that isn't so invasive.
Edit: I put it back together to the best of my memory, found one cow wandering about so I stuck it in the water pit.