Persistent journal takes more than maximum limit set and vacuum doesn't happen

Issue

• Even though a limit for persistent journal is set (e.g. SystemMaxUse=2G), the journal takes more space

  # journalctl --disk-usage
  Archived and active journals take up 2.3G in the file system.
  

• Vacuuming manually doesn't reduce the journal space usage

  # journalctl --vacuum-size=2G
  Vacuuming done, freed 0B of archived journals from /var/log/journal/<machineid>.