No gear equipping sound or subtitle when a shield is placed into the offhand slot

The bug

MC-94060 was fixed in the first 1.19 pre-release for most equipable items. However, shields are still completely silent when placed in the offhand slot, whether it be by dispenser, shift-clicking, mainhand/offhand switching or manually moving it to that slot. As the first two of these effectively imply that the shield is "gear" with a designated slot, the lack of a sound/subtitle for this is inconsistent.

How to reproduce

1. Obtain an armor piece
2. Obtain a shield
3. Have dispensers equip both of these to you

Expected results

Both of these would play gear equipping sounds where appropriate.

Actual results

Only the armor piece plays a sound - the shield is completely silent.

Further notes

A unique sound event should be implemented for this as per MC-251919, as a generic subtitle is undesirable.