logrotate script cause "Read-only file system" error while writing logs in /etc/ or /usr/ directories

Issue

• logrotate postrotate script cause "Read only filesystem" error while writing logs in /etc/ or /usr/ directories, but same script works in RHEL 8, and it runs well in RHEL 9 with interactive execution.

  /var/log/myservice/*.log
  {
    weekly
    rotate 7
  ...
    postrotate        
      sh /etc/myservice/myscript.sh     <<==== this script output logs to /etc/myservice/log/*.log, and it fails with `Read-only file system`
    endscript
  }
  
  OR
  
  /usr/local/example/var/*log {
    missingok
    notifempty
    size 5M
    copytruncate
    su nagios nagios
    rotate 1
    compress
  }
  

  Log example:

  Aug 22 00:01:07 myrhel9 logrotate[33408]: /etc/myservice/myscript.sh: line 4: /etc/myservice/log/myservice.log: Read only filesystem
  
  OR
  
  Jan 22 14:22:32 otherrhel9 logrotate[123464]: error: error opening /usr/local/example/var/cleaner.log: Read-only file system