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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
It has several flaws, one of them being failure to check that session.save_path value is a default one for a given OS (or in other way restrict potential adverse effects of changing permissions).
Just fix your /tmp permissions. It restricts itself to running only once, so don't worry.
I can confirm this issue. We have seen /tmp permissons changed on all Plesk 10.4 machines after MU #41 was installed. Again a wonderful example of the lack of testing at Parallels.
Worth noting that we use /tmp as PHP's session.save_path instead of the default value.