Describe the bug
Right-clicking with items in your hand to drop one item at a time no longer works.
I have been using this feature from the beginning of time.
In the version appliedenergistics2-rv6-stable-7-extended_life-v0.55.21.jar it works in the versions appliedenergistics2-rv6-stable-7-extended_life-v0.55.29.jar to 27 it does not work. I have not tried it further down.

To Reproduce
Grab a stack of any items in the GUI of the terminal and press the right mouse button to drop one item at a time. Nothing happens.

Expected behavior
Obvious

Additional context

Environment
Pack Nomifactory CEu 1.7 alpha 2a

• Minecraft Version: 1.12.2
• AE2 Version: appliedenergistics2-rv6-stable-7-extended_life-v0.55.27.jar - appliedenergistics2-rv6-stable-7-extended_life-v0.55.29.jar
• Forge Version: 14.23.5.2860