This report is incorrectly marked as duplicate of MC-141942.
Whilst both bugs involve the "Pick Block" keybinding, they are separate issues.
This bug prevents duplicating items in creative by pick blocking and dragging when the pick block key is not bound to middle click.
MC-141942 prevents the "Pick Block" from taking a stack of the item from the creative search menu, which is not the same issue as stated in this report.
Additionally, this bug still exists in the latest version of Minecraft (1.20.2).
I can confirm this behavior.
I can confirm this bug as I found it getting a screenshot for another bug report.
For Bug Tracker Search Result Reasons: This also appears on Player Heads.
I can confirm, also could the post include "Dinnerbone"/"Grumm" for better searchability so duplicates aren't made?