Welcome to the forum 
In the AMS options, did you enable the “AMS filament backup”? That is the key to automatically continue printing from a different slot
In the same place, you can choose when the AMS should read the RFID tags. I think you can turn them all off so that it completely ignores them. Maybe that would have helped? At least you don’t need to rip the tag before the spool is empty.
Apart from that, I think I would have tried exactly the same steps. The second error looks more like a bug in this special situation to me.