Non-shield items with shield item model are oriented incorrectly in first-person when blocking with blocks_attacks component

Description

Non-shield items (given the same components as a shield) exhibit an incorrect orientation and position in first-person when blocking.

How to Reproduce

1) give yourself a shield

2) give yourself a non-shield item (like a stick) with the item_model component set to 'shield' and the blocks_attacks component enabled.

/give @s stick[item_model=shield,blocks_attacks={}]

3) hold and use both items, comparing the difference in shield model placement on-screen in first person while blocking.

Expected Result

Given that they share the same item model, the non-shield item (or "fake" shield) should appear in the same position and orientation when blocking as a real shield.

Observed Result

The "fake" shield has an incorrect orientation and position on-screen compared to the "real" shield. The fake shield appears to be facing downwards and offset down.