ether config IPv6-only after upgrade from F30 -> 31

Ran the upgrade from Fedora 30 -> 31 per the usual dnf process. Everything went well EXCEPT: after restarting and signing in my ethernet port on DHCP (Intel 218V gigabit) was configured only with IPv6. Forced an IPv4 address onto the i/f then set routing to the ISP router, but problems continued: couldn't see my NAS box (connect failed), couldn't pull up a browser to any external location. Thankfully my mobo has dual NICs, and moving to the secondary jack (Realtek RTL8111GR) everything came up fine. Anyone have a similar situation show up, or a suggestion for recovering the original NIC?

setup: Asrock Z97 Extreme 6, i7-4790k, AT&T fiber router (Arris/Pace 5268AC).