Version 3.1-3-1 of car is marked for autoremoval from testing on Sun 11 Jan 2026. It depends (transitively) on r-cran-bit64, affected by #1120994. You should try to prevent the removal by fixing these RC bugs.
vcswatch reports that
this package seems to have a new changelog entry (version
3.1-3-2, distribution
unstable) and new commits
in its VCS. You should consider whether it's time to make
an upload.