Yes I know github wont work, I think I am referring to what you call the deep dark corners
. Its been a little bit since I have been without internet for an extended period of time, but the last time this occurred, all the integrations I mentioned stopped working. Unifi Protect would not start at all because it would fail trying to resolve the domain(even though it was resolvable), and same with the other integrations.
I thought there was a github issue for this, but the closest I can find is the one for the file editor which isnt directly HA. The only DNS related thread is this one, which mentions a few similarish issues with DNS not working, Local DNS! - #183 by robot468