Player prioritizes offhand shield over mainhand unlike Java

Bug:
The Player will prioritize the offhand shield when guarding even when holding another shield in the mainhand
How to reproduce:
Hold a shield in both mainhand and offhand and sneak to guard.
Expected Behavior:
The player will guard with the shield in the mainhand similar to when guarding with shields in both hands on Java
Actual Behavior:
The player will guard with the shield in the offhand