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Are you using multiple monitors? With X11 multi-monitor setups one of the monitors always tears if the framerate aren’t multiples of each other (e.g. 120Hz + 60Hz works fine, 144Hz + 60Hz results in tearing with one of them). This is also the case with variable refresh rate (FreeSync), but VRR shouldn’t be an issue as it’s not enabled by default on X11 iirc.

You’d have to manually enable Wayland, because PopOS disables it by default (does not show in the login menu/GDM). Keep in mind that PopOS is based on Ubuntu 22.04, which is quite old at this point. Wayland might not be as good of an experience for you because lots of improvements happened over the last two years.

PopOS will release their new desktop environment with updated packages in a few months, which should work well for gaming and fix your tearing issues.

If you want to try whether Gnome Wayland solves your issue, you can edit /etc/gdm3/custom.conf and set WaylandEnable=true. After a reboot you should be able to select Wayland in the bottom right corner at login.