Been trying to play this on 1.5 and have been running in to issues where making musts or brewing the alcohol will throw exceptions or lock up pawns. I can unlock the pawn by forbidding the item, in this case the unfermented kvass, and the game will act normally. If I unforbid the kvass the game will slow down and the game will start logging the errors when the pawns try to move it.

Here is the hugs logs if that will help https://gist.github.com/HugsLibRecordKeeper/1a36e8a146f97130d4c615c681cb47a9