You can't use scrollwheel-clicking to pick an item if the selected inventory slot has a destroyable item in it.
It doesn't change the inventory slot.
Also see the attachment.
You can't use scrollwheel-clicking to pick an item if the selected inventory slot has a destroyable item in it.
It doesn't change the inventory slot.
Also see the attachment.
Took me a while to find it, but...
Duplicate of Works As Intended
MC-327