Nope, your mistake is, that you’re blaming others for your faults. And that you seem to be a little egotistic - as I said, half the world doesn’t have summer. So assuming, the rest of the world depends on you and when you go on holiday, is a little over the top…
Anyway, I’m out, as the OP is totally right, this is hijacking his thread.
Sorry, you’re totally right! 
Have you checked, if you’re affected by the database migration and if that’s the cause?
If my guess is right, and you haven’t taken the time to wait for the migration to finish, you might not be able to restore the backup correctly.
Normally the restore process includes all add-ons and integrations (including HACS). These aren’t safed in the backup, but get downloaded in the correct version during the restore. Your other configuration settings should be in the backup as well, like the panels you mentioned.
What you could do now, if it doesn’t want to start again, do a fresh install and restore one of the most recent backups. That should bring you to the version of HA, that was recent when the backup was taken. See if everything works and do the update again - and give it time to finish the migration in the database. I’ve seen reports, where people neede to wait hours(!!), before it finished. If this doesn’t work either, still assuming the db migration is your problem, there is a guide to do that migration manually. I can search for the thread, if necessary!
EDIT: Found the thread, here are the instructions on how to do that migration offline:
Let us know, what you’re doing and if it works!