The five attached screenshots do a good job of explaining part of the problem. Here are reproduction steps for a more complete representation:
1. /clear
2. Put 2 stacks of stone in your inventory and 2 stacks of stone in your hotbar
3. Grab any other item, perhaps a grass block, and shift-double-click one of the stacks of stone in your inventory with it
Expected: 4 stacks of stone in the hotbar. Actual: 4 stacks of stone in the inventory.
MC-13289 suggests that this is indeed a bug.
Linked issues
is duplicated by 2
Attachments
Comments 12
Hm, then either this ticket or MC-13289 is working as intended.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Does MC-13289 describe your issue ?
If not, please attach screenshots.