Hello, Similar issue on one of my machines running Testing where I could not upgrade mesa-libgallium to the latest version in the repository. What I did to solve the problem was to remove the package mesa-va-driver, as I noticed that it is now a virtual-package, provided by mesa-libgallium.
However, mesa-va-driver is still a regular package in Sid at version 25.2.8-2, while mesa-libgallium is at version 25.3.3-1. I wonder if the transition to a virtual package is what caused this problem.

