This proposal is for an I2NP message that can be used to reset the session tags between two Destinations.
Imagine some destination has bunch of confirmed tags to another destination. But that destination got restarted or lost these tags some other way. First destination keeps sending message with tags and second destination can't decrypt. Second destination should have a way to tell first destination to reset (start from scratch) through an additional garlic clove same way as it sends updated LeaseSet.
This new clove must contain delivery type "destination" with a new I2NP message called like "Tags reset" and containing sender's ident hash. It should include timestamp and signature.
Can be sent at any time if a destination can't decrypt messages.
If I restart my router and try to connect another destination, I send a clove with my new LeaseSet, and I would send additional clove with this message containing my address. A remote destination receives this message, delete all outgoing tags to me and start from ElGamal.
There is pretty common case that a destination is in communication with one remote destination only. In case of restart it should send this message to everybody together with first streaming or datagram message.