It’s a warning so something is up with the things in questions. It’s complaining about the configuration for the Thing and it sounds like it didn’t get updated during the upgrade process or something like that..
I’d try deleting these seven Things and recreating/discovering them. Take note of the random parts of the UI and reuse that for the recreated Things. That will make them have the same ID and therefore all your Links to Items will still work. If that doesn’t work, as the error message says, it needs to be fixed in the binding so file an issue.