Version 2:2.28+dfsg-1 of slime is marked for autoremoval from testing on Sun 11 Aug 2024. It is affected by #1076296. You should try to prevent the removal by fixing these RC bugs.
vcswatch reports that
this package has been uploaded into the archive but the debian/changelog in the
VCS is still UNRELEASED. You should consider pushing the missing commits
or updating the VCS.