Basically, all of the cats/ocelots I spawned/found in my World all had 3 legs, the Cats were missing their front left legs, and the ocelots are similar, but it's their front right legs.
I'm not very certain if it only affects my world, or if it's a problem with the version, but It's an error that makes me curious, and also got a laugh out of me.
Hello, this is already being tracked in MC-203644.