Test-IcingaForWindows doesn't indicate the error "Certificate validation failed for IfW API on host 'localhost' [...] hostname mismatch"

[tectumopticum]

After changing the hostname and creating a new certificate for the icinga2-agent, the icingaweb2-output of local plugins show
"Certificate validation failed for IfW API on host 'localhost' (SNI: 'hugo.my.domain'; CN: 'hugo') port '5668': code 62: hostname mismatch"
Running Test-IcingaForWindows doesn't indicate that there's any problem with a certificate.

BTW: executing Start-IcingaWindowsScheduledTaskRenewCertificate; solved the certificate-issue.