Are their any plans for some kind of on-board rollback to an update so when faced with even worse, no Internet, then we can get back working? I don't have the luxury of stand-by devices or the ability to run VM versions with snapshots. Had my Internet been inaccessible I would have be royally screwed as my mobile access is next to nothing here, and mostly sub-3G which did fortunately work on this occasion to find this thread - without Internet trying to find help is a nightmare.
For rollback DNS is required, you should be able to to set DNS server in System : Settings : General and tick the checkbox to not use local unbound. Then it should work too.
Then just wait a week or so
https://twitter.com/opnsense/status/1339847119977533442
opnsense-revert -r 20.7.6 lighttpd && configctl webgui restart
opnsense-revert -r 20.7.7 lighttpd && configctl webgui restart