This happens on debian bookworm:

At the start of every agent run, the puppet agent seems to change the ownership of /var/cache/puppet to puppet:puppet

Deploying puppet::server::config causes the ownership to be changed to root:root

This change in ownership then causes a restart of puppetserver, which is kindof annoying to have happening on every puppet run.

I'm not sure why vardir is set to ownership root:root, is there any harm in having it owned by user puppet?