Background jitter when using Cinemachine and Pixel Perfect Camera

I am experiencing background jitter when using Pixel Perfect Camera with Cinemachine, specifically when the player moves up and down. My background object are children of the Main Camera (if I set them to be children of the Virtual Camera, they move with the player), have 16 pixels per unit and are aligned with the pixel grid.

The jitter doesn’t happen if I remove Pixel Perfect Camera or use Scene view, so I am confident that’s causing the issue.

Here are my camera settings and a video of what happens