Scarabs disappear when using Ctrl-click in a full Map Device

If all 5 slots in the Map Device are filled with scarabs (20 scarabs per slot), using Ctrl-click to add additional scarabs of the same type causes them to disappear.

Steps to reproduce:

Fill all 5 Map Device slots with scarabs, reaching the maximum of 20 scarabs in each slot.

Ctrl-click scarabs of the same type from your inventory into the Map Device.

The scarabs are removed from the inventory but are not added to the Map Device or returned to the stash.

Result:

Scarabs vanish completely and cannot be recovered.

Expected result:

Additional scarabs should either not be consumed, or be returned to the inventory/stash when the slot is already at maximum capacity

im dumb