[~gaborkb]:
When backported to 2.9.X, write to this slack thread: https://unity.slack.com/archives/C0105CH72UV/p1650007646541099.

----

Reproduction steps:
1. Open the attached project and "Confiner2D sample" scene
2. Move the player by pressing A or D (touch one side of the screen, then another)

Expected result: Camera doesn't move
Actual result: Camera slightly moves when crossing the center of the screen

Reproducible with: 2.7.2, 2.8.4 (2019.4.37f1), 2.8.4 (2020.3.32f1), 2.8.4 (2021.2.0b17), 2.9.0-pre.1 (2022.1.0b14), 2.9.0-pre.6 (2022.2.0a9)
Could not test with: 2.6.0, 2.7.1 (2019.4.37f1) (no Cinemachine Confiner 2D)

Workaround:
1. Select 'CM vcam1' in the Hierarchy window
2. Disable "Cinemachine Confiner 2D" and enable "Cinemachine Confiner" in the Inspector window