alt Hacker Newssystemd-tmpfiles bugs the heck out of me. It breaks so many applications for absolutely no good reason. A typical system of mine not running it gathers less than 1GiB per year of uptime in /tmp with disk sizes measured in TB. Even if you are /tmp on a 256GB NVME, that's less than 1% of your total disk per year of uptime. If you upgrade to alternating Ubuntu LTS editions (which requires a reboot every 4 years) systemd-tmpfiles will save you a maximum of 4GB of disk space.
If you care about slow tmp leaks, you could also just use a 1-line, decade+ old solution; no additional software required, since your machine already has cron, find and xargs on it:
https://askubuntu.com/questions/431058/using-a-cronjob-to-cl...
If you miss that "will this eat my system?" adrenaline rush you get from systemd-tmpfiles, you could just use cron + find, but replace xargs with the -delete option.