The "Pick Block" key being used on a decorated pot does not save the NBT data (the faces and designs of the pot)
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While, yes, that's normally a requirement to copy NBT, there are exceptions. Since the NBT on decorated pots only determines a visual factor it matches banner patterns, which copy over without using ctrl.
I'd suggest letting mojang decide on this.
Some extra information if it helps, this pot i am using Pick Block on has 1 decorated face, and 3 empty faces. Seems to be a problem with all pots that are decorated