Description:

Every time i try starting a service and autocompleting it's name in bash, issuing a command like 'systemctl start reflector.service', it shows a message about a not-found service like below.

systemctl start refUnit auditd.service could not be found.
lector.service

I tried masking auditd.service but then it just showed 'Unit plymouth-quit-wait.service could not be found.' instead.

It seems it's following the list of not-found services below.

systemctl --all --state=not-found

UNIT LOAD ACTIVE SUB DESCRIPTION
● auditd.service not-found inactive dead auditd.service
● plymouth-quit-wait.service not-found inactive dead plymouth-quit-wait.service
● plymouth-quit.service not-found inactive dead plymouth-quit.service
● plymouth-start.service not-found inactive dead plymouth-start.service
● rc-local.service not-found inactive dead rc-local.service
● syslog.service not-found inactive dead syslog.service

As a temporary workaround, i masked all not-found services and that solved the issue. But i don't think bash-completion showing this message concatenated inside the actual command is the right behaviour.

Before anyone asks, this is a new install and none of the services have been installed or uninstalled manually before.

Additional info:
systemctl --version
systemd 231
+PAM -AUDIT -SELINUX -IMA -APPARMOR +SMACK -SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN

Steps to reproduce:
Try bash autocomplete feature issuing 'systemctl start' command with any service name and having not-found services as described above.