Cartographer trade bug crashes the game

all cartographers have basically the same trade offer (7 out of 7 cases tried both in creative and survival worlds) - first beeing paper, than compas and the third unlocked trade is an empty map

i got suspicious about number 1, as i was unable to get any treasure maps out of my cartographs on survival, so i tried in creative...
every time i buy all empty maps i can afford for stack of emeralds my game crashes after several seconds while not overloading ram nor cpu, so i suspect a deadlock occurance in your java code 🙂