Facter 4.x on MS Azure: wrong domain is used in FQDN

Facter 4.x on MS Azure: wrong domain is used in FQDN
When running Facter 4.0.49 on MicroSoft Azure, instead of using the actual DNS domain, the Azure's default DNS suffix: reddog.microsoft.com is being used:
Facter: fact "domain" has resolved to: reddog.microsoft.com
Facter: fact "networking.fqdn" has resolved to: myhost.reddog.microsoft.com
Facter: fact "fqdn" has resolved to: myhost.reddog.microsoft.com

The actual DNS domain is: mydomain.mytld

The DNS does not have myhost.reddog.microsoft.com, so any network request to the bad FQDN fails.

Whereas Facter 3.x has the correct domain on the same Azure environment:
Facter: fact "domain" has resolved to "mydomain.mytld"
Facter: fact "fqdn" has resolved to "myhost.mydomain.mytld".