The mentioned periodic clean up of tmp files is not enabled out-of-the-box in case of a upgrade from previous Debian versions, see https://www.debian.org/releas

The mentioned periodic clean up of tmp files is not enabled out-of-the-box in case of a upgrade from previous Debian versions, see https://www.debian.org/releases/trixie/release-notes/issues.en.html#the-directories-tmp-and-var-tmp-are-now-regularly-cleaned https://www.debian.org/releases/trixie/release-notes/issues.... .