After using GNOME 43 Xorg with Debian Bookworm 5.19, I rebooted into Ubuntu 
22.04 Xorg 5.15, did some checks and found out that on my Ryzen laptop this was 
caused by the amd_pstate scaling driver which lowers the minimum CPU frequency 
down to 400 Mhz instead of the 1400 Mhz default on the acpi_cpufreq which 
Debian uses.

Debian (acpi_cpufreq) behaved perfectly on both Xorg and Wayland, so I enabled 
the amd_pstate scaling driver and this issue came up the exact same way as in 
Ubuntu: it seems that scaling down a much lower cpu frequency and then back up 
all the times can cause some performance penalties and glitches.
To me it's fine because in the Xorg session I disabled the animations and the 
battery life is noticeably better with the amd_pstate scaling driver, but as 
usual ymmv!

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https://bugs.launchpad.net/bugs/1969140

Title:
  Window minimize animation flickers and appears in the wrong place in
  Xorg sessions

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