pmcd(pid) Error: Permission clash for unix: with earlier statement for unix:

Issue

We noticed there is an error in the pmcd service. But the pmcd seems run normally:

# systemctl status -l pmcd
● pmcd.service - Performance Metrics Collector Daemon
   Loaded: loaded (/usr/lib/systemd/system/pmcd.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2023-08-02 15:21:13 CET; 1min 34s ago
     Docs: man:pmcd(1)
  Process: 2649916 ExecStop=/usr/libexec/pcp/lib/pmcd stop-systemd (code=exited, status=0/SUCCESS)
 Main PID: 2650463 (pmcd)
    Tasks: 10 (limit: 820740)
   Memory: 48.3M
   CGroup: /system.slice/pmcd.service
           ├─2650463 /usr/libexec/pcp/bin/pmcd -i 10.0.0.1
           ├─2650468 /var/lib/pcp/pmdas/root/pmdaroot
           ├─2650469 /var/lib/pcp/pmdas/proc/pmdaproc -d 3
           ├─2650471 /var/lib/pcp/pmdas/xfs/pmdaxfs -d 11
           ├─2650474 /var/lib/pcp/pmdas/linux/pmdalinux
           ├─2650475 python3 /var/lib/pcp/pmdas/nfsclient/pmdanfsclient.python
           ├─2650483 /var/lib/pcp/pmdas/kvm/pmdakvm -d 95
           ├─2650484 /var/lib/pcp/pmdas/dm/pmdadm -d 129
           └─2650485 python3 /var/lib/pcp/pmdas/openmetrics/pmdaopenmetrics.python

Aug 02 15:21:13 host systemd[1]: Starting Performance Metrics Collector Daemon...
Aug 02 15:21:13 host pmcd[265035]: [Mon Aug  7 15:21:13] pmcd(265045) Error: Permission clash for unix: with earlier statement for unix:
Aug 02 15:21:13 host systemd[1]: Started Performance Metrics Collector Daemon.