Ok I was able to reproduce it. The tearing happens, because (quote)
"rotation is handled by doing a blit in the server which isn't
synchronised to anything."
The 'modesetting' driver should gain support for 'TearFree', but that's
unlikely to happen anymore because everyone has mostly moved to Wayland
already.
** Package changed: linux (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1928507
Title:
Screen tearing for video playback is observed after screen is rotated
180 degree in Ubuntu 20.04, Gnome Vanilla, X11
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