Just updated to 1.14.3. Playing a world started under 1.14.1.
Librarian trading windows either do not open, or flash open and immediately close. n This only happens with librarians. Also, after about sixty attempts to keep a trade window open, I have three stacks of wheat and four stacks of wheat seeds in my inventory, that were not there before trying to trade.
Please do not mark unreleased versions as affected.
You don't have access to them yet.