Horizontal camera movement while mounted is extremely delayed at lower tick rate

Camera movement usually remains real time regardless of tick rate.
This changes when you're mounted however. You still retain real time control of your view vertically, but your horizontal inputs are processed weirdly.

Steps to reproduce

• Get in a minecart

• Set tick rate to 1

• Try to look around

Observed results

• You cannot freely look around as you would normally
  

Expected results

• Being in a mount wouldn't change how the camera works