[Microtransactions] Vanishing Dye cannot be applied to Focus (off-hand)

Attempting to apply the Vanishing Dye microtransaction to an equipped "Focus" off-hand item does not work. The item remains visible in the game world, and the UI may return a "Microtransaction-type mismatch" error.
Steps to Reproduce:
Equip a Focus in the off-hand slot.
Open the Cosmetics menu (shortcut: K).
Select the Vanishing Dye microtransaction.
Attempt to apply it to the off-hand/Focus slot.
Expected Result:
The Focus item should be hidden, similar to how shields or armor can be hidden.
Actual Result:
The Focus remains visible. The dye is either not applied, or an error message appears.