In earlier versions, the player's head used to be fully synchronized with the mouse cursor when you turn your head. This might still be a thing in Bedrock Edition.
If you move your head in either direction in versions where the head rotation is interpolated, it is not fully synchronized with the mouse. Here are some videos comparing from b1.7.3 to 1.19.4.

The solution is to make the head not use the interpolate rotation function. It should be using the regular rotation yaw variable, so it properly synchronizes with mouse movement.