Pretty much the same case as MC-188489.
Image shows example of what happens when typing "C418" when the mouse is over the first slot.
MC-188655
Number keys in Creative search override typing in the search bar, resulting in unintentional hotbar item switching
Resolved
Fixed
1
(Unassigned)
Community Consensus
Normal
Inventory
creative-inventory
1.15.2, 1.16 Pre-release 3
1.16 Pre-release 5
Retrieved
I hope this report is re-evaluated, and try to add a way to keep the use of the numeric keys in this section, but also to make them work in the search bar ... One solution would be that you could only type if the mouse is above the search bar.