But I suspect your artefact problems are due to Mesa. IIRC there was a recent thread over at the Arch forums in which an AMD user fixed the glitches by using the mesa-git AUR package, which should also be installable in Artix. The most recent Mesa packages in Debian are only available from the experimental repositories and they are the same as the Arch (non-AUR) versions. The versions in sid/ceres should catch up once Debian 11 has been released though.
EDIT: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4691
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