Using the /clear command in any way clears any item out of a players 2x2 crafting-grid.
It does not matter which selector you use (as long as it is a player, of course), wich item you clear, or what amount.
Example:
(Create &) Open any world between 20w07a and 20w19a (newest snapshot at this time)
Use either a datapack or an active repeating commandblock to run this command every tick: /clear @a dirt 0 or /clear @p stone 1 (or any other varitation, as I said)
Try to put any item(s) in your 2x2 crafting-grid in your survival inventory.
The item(s) is/are gone.
The bug is since snapshot 20w07a, in 20w06a it wasn't there.
Linked issues
Comments 2
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We're tracking this issue as MC-172272, so this ticket is being resolved and linked as a duplicate.
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I could confirm and replicate this on Windows 10.