Upstream issue #7071 [1] seems to be related, with similar artifacts and the issue being first reported in Mobian, which shares the same mesa package as Debian. If this is true, the offending commit would be 53445284a427f79e94607dc4ca2f8bd8ac293356. -- Ben Westover [1] https://gitlab.freedesktop.org/mesa/mesa/-/issues/7071
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