Same problem here and seen a couple of times already. I'm just testing a W2019 deployment in VMware Workstation. Brought up W2019 server, added DNS, DHCP and promoted to DC. Internet is clearly working as can browse BBC website. DNS settings on the DC look correct - forwarding to the router and using 127.0.0.1 for it's own settings. Also deployed a W10 DC using DHCP and added to domain. It's fine, i.e. not reporting "No internet"