I right-clicked the mallet and put it in the bank from my inventory, but it just disappeared. I've reloaded UI and it's still not showing. I confirmed it's in the bank by disabling Bagnon and checking the bank, but even after re-enabling the addon it's still not showing it.

I just realized that nothing is displaying in the bank after I deposit it in there. Seems like the bank is stuck in a snapshot of what it looked like after I updated Bagnon.