@tryashtar That's an unrelated bug. MC-141942 explains specifically interactions in the search menu, while this bug explains the drag duplication of items in any menu while in creative mode. The common thread might seem to be the re-binding of the "pick block" key, but the behavior isn't related. Fixing MC-141942 wont fix this bug, and vice versa.
Can confirm in 1.19 Pre-release 3