Free look Camera has jerky movement under specific circumstances

I have an edge case with the Cinemachine Free Look Camera. When the X axis input value returns to zero, it will briefly "Pop" in the direction it was originally rotating in by a noticeable amount, but only if the following conditions are met. If any one of them is not met, the bug will not trigger.
1) The input is being set externally (i.e. By setting the Input Axis Name to nothing, and driving m_XAxis.m_InputAxisValue)
2) The Brain's update method is set to "LateUpdate" (It also triggers in "smartUpdate" in our current project, but I'm unable to reproduce this in the demo project I've attached).
3) The Free look's binding method is set to "World Space".
4) The Value of the Y Axis is NOT 0.5 (The effect is most obvious as it approaches 0, or 1).
5) The Frame rate is low (I'm pretty sure the bug triggers regardless of frame rate, but it's almost imperceptible at 60+ fps. I've locked the framerate at 20fps in the demo project to highlight this).

I've attached a demo project that reliably reproduces the effect. It's setup to work with controller, as it showcases the effect best, but you can still notice it with mouse input.

 

Oh that's fantastic! Thank you so much for taking care of that so quickly Gregoryl, really appreciate it!