Space bar does not refill the trade slot when Trading with villagers.

Since this version, when trading with villagers, the space bar does not refill the trade slot like in former versions.

Mass Trading ist not possible anymore.

Steps to reproduce:
Just try to trade several stacks of sticks with a fletcher.

Expected result:
The trading slot gets refilled with the previously chosen item

Actual result:
One trade is made, then the space bar shows no reaction. Crafting on the other side works fine.