Cow Crusher broken?

Built two Cow Crushers (via wattles video) and made sure they were built EXACTLY like he did...but no matter how much wheat I pump in, the dying cows just don't drop anything into hopper and chest. I know the hopper works because I tested it before I got the cows into it. Is that now no longer working? Any help would be appreciated.
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Update: finally got sick of the noise and just killed them all in the contraption. Took a long time...there were hundreds, maybe even over a thousand each. All the meat and leather deposited into the chest no problem. Methinks some mechanic has changed where they don't crush themselves after 24 anymore. Since no one responded, I guess I am on my own.
 
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