Commit failing with invalid fqdn format after upgrade to PAN-OS 9.1.1

• Commit failed after upgrading to PAN-OS 9.1.1 with error invalid FQDN format (.xxxx)
• Issue Observed with panorama and managed firewall where the same format was working prior to the upgrade to 9.1.1.
• Error message is seen similar to the one shown below.

Validation Error:
vsys -> vsys1 -> address -> xxxx.io -> fqdn '.xxxx.io' is invalid
vsys -> vsys1 -> address -> xxxx.io -> fqdn is invalid
Commit failed

• Any Panorama
• Any Palo Alto Firewall.
• Address Object/FQDN
• PAN-OS 9.1.1

• FQDN cannot start with '.' (dot) and so '.xxxx' is an invalid FQDN.
• In the Pre 9.1.1 releases,  these bad domains will pass commit, but fail to resolve and cause feature specific issues. With the latest version, we identify this as early as possible due to the more stringent check to avoid this issue.