I've noticed when feeding&milking aurochsen that sometimes I get to the point when they accept clover but give no milk anymore. Then I've acted lazily and asked in a realm chat only to be pointed to the W11 changelog, according to which I should be able to milk them only once. While I'm totally sure I've never got less then 2 successful milking per aurochs, usual number being like 3-4, probably... always forget to count.
I don't see anything stated about aurochsen, clover, or milk after that changelog, so I suppose it's either a bug or an undocumented correction. I'd selfishly prefer it to be the latter, half a bucket of milk from each met aurochs is better than only a flaskful, though either is better than eternal&instant clover-conversion. Feel free to shame me if it was really stated somewhere.