Setting button inputs while using Joy-Con 2 Mouse controls have the R and ZR buttons get assigned

Short Description: Using the Joy-Con 2 mouse while setting button mapping will cause the R and ZR to get assigned before any button can be pressed.

Steps to reproduce:

1. Open Minecraft Beta and navigate to Settings.

2. Open the Joy Con 2 Mouse controls menu, and scroll down to the button mapping.

3. Attempt to reassign one of the buttons.

Expected Result: Selecting a mapping with R or ZR will allow any button to be pressed to assign it.

Actual Result: Selecting a mapping with R or ZR instead assigns those buttons to the mapping, but only occasionally when selecting with R. Selecting with ZR will never allow for buttons to be remapped.