A typical approach for managing both private and public DNS zones for the same domain such as dev.example.com is to use split-horizon DNS. In this setup, internal queries (from your VMs) are directed to the private DNS zone, while external queries (like ghs.googlehosted.com) are resolved through the public DNS zone. You can configure DNS forwarding rules and split the DNS resolution for internal and external resources by using Google Cloud DNS policies or third-party DNS services if needed.

For further reference see : Split horizon DNS example