Comment 1 for bug 1941941

This appears to be more an "out-of-date" flag for libplacebo source package (rather than a bug with the packaging), with the new upstream version fixing the bugs experienced when using newer Mesa drivers on the mentioned Intel hardware.

A new build of libplacebo has been uploaded today as follows:

* libplacebo 3.120.3-2 from Debian testing => ppa:savoury1/{mpv,vlc3}

The new libplacebo has also been built with the latest available KhronosGroup software uploaded today (including spirv-headers 1.5.4.git20210817, spirv-tools 2021.3, and glslang 11.6.0) and should fix the issue according to upstream information, as you mentioned.