Logitech G920 - Brake pedal = Downshift on Xbox One X?

I’m having a strange problem where the brake pedal on my Logitech G920 wheel downshifts the car instead of stopping it when playing FH4 on Xbox One X. Has anyone else had this issue & fixed it?

When I look in the controller settings menu it shows that a wheel is attached but there are no mappings for up/down shift & won’t let me change it.

The G920 works fine on Forza 7 on the same Xbox, so I assume it’s not the console causing the issue. Thanks in advance for any assistance you can provide.