Creative Shulker Box Breaking

I do not know if this issue occurred before, but since when did breaking a shulker box In creative mode give back the item? I was doing some pixel art, and I was using the bottom sides of the shulker box. When I broke the box, It gave back the item. Usually in creative, you do NOT get the item back. Now I understand that farms do include shulker box loading systems, but that only automates that by pistons, so I know why THAT would drop a shulker box. Please confirm to me if this is a bug!