When trading bulk paper with librarian villagers, after several successful trades, the game will crash and I lose progress.

Steps to reproduce:

1. Have about 30 librarian villagers ready for trading

2. Make sure villagers have 1 paper = 1 emerald to speed up process (cure zombie villager nearby)

3. Put at least 16 paper in left trading slot (to ensure maximum amount of trades)

4. Mass trade (not one at a time)

5. Repeat a few times and game will inevitably crash