Shift-clicking items from the Wandering Trader does not work

When interacting with the new "Wandering Trader" mob, I encountered a bug upon trading. Trying to shift click items out will result in the trade being locked, and only one trade will be completed. No emeralds are consumed, resulting in free items (but a locked trade).

The bug seems to consistently appear, both in Creative, Survival and Adventure Mode, and all of the trades seem to be affected. Trading with the villager without using Shift seems to work as intended.