Trade will be banned if you use shift+click to trade

When trading with villager or wandering trader If you hold shift it will buy one stack of item but trade will be forbidden. If you just click without holding shift trade could be repeaten until it blocks as well by game mechanic. Tried this much time, it definetly a bug.

1. Choose any trade.
2. Trade while holding shift
3. Banned

(On pictures I traded emeralds with only clicking abd than traded cloth pants with click and then holding shift.)