while riding an entity that has the "lock_rider_rotation" in the ridable component if you are in third person you can rotate more than the number specified

command blocks can detect this so it isn't just a visual bug

while in first person you can only change pitch

i tested this on windows and android

in case this recording isn't an explanation enough i have included the world and behavior pack as demonstration

I have lock rotation set to 0 in the example given