Version 20210322-1 of materia-gtk-theme is marked for autoremoval from testing on Thu 30 Jun 2022. It depends (transitively) on nvidia-graphics-drivers-tesla-470, affected by #1011146. You should try to prevent the removal by fixing these RC bugs.
Last update: 2022-05-25
Standards version of the package is outdated.
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.6.1 instead of