Third-person vehicle camera stutter since 1.2.1.0 (certain vehicles only)

Since season 2 start, with patch 1.2.1.0, when in third-person view with certain vehicles, looking around/panning the camera exhibits a noticeable stutter and the motion is not smooth. The only vehicles that exhibit this issue seem to be ones where you can physically see your character on/in them, such as the quadbike, jeeps, and now the dirtbike. Vehicles such as the tanks, jets and helicopters do not seem to exhibit the issue by the looks of it, or at least at a much lesser degree to the point it's hard to tell whether it's there or not, even when recording & viewing slow-motion videos.

This does not appear to be a render/performance stutter, as my framerate does not fluctuate and using the in-game frametime graph shows a very flat graph. This is purely a camera stutter. Unlike the general mouse input issue that has been reported already, this camera stutter while in third-person is also present when looking around with arrow keys, whereas with the general mouse input issue, the arrow keys are perfectly smooth.

I had no issues with mouse input, when in vehicles, before patch 1.2.1.0. I have always had the jittery/choppy mouse input when as infantry.

I have not seen anyone else post about this, so presumably it's not a widespread problem. I am playing on PC (9800x3D, RTX 4090) have up to date Windows and Nvidia drivers. I do play on a 21:9 monitor, in case that is somehow affecting it.