This is very late and I do not know if it changed in 1.21, but for future Google searches:
Try holding ALT (keybind for making your mouse visible on screen) while doing the usual keybind such as Alt + Ctrl + Shift + Right Click.
While extreamly awkward this worked for me to place stacks and Alt + Ctrl + Right Click for withdrawing stacks.
P.S. Of course you will need to be close enough to and have your pointer hover over the crate you wish to interact with.
Happy sailing