[core] Fix stalled connection that should break after rogue NAK/ACK reception #3105
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Fixes #3088
The problem: upon reception of the rogue ACK or LOSSREPORT, the procedure that should cause breaking the connection puts the connection in a "stalled" state, where every single ACK since that point on is rejected, but the connection is still maintained and keepalives are exchanged. The connection can no longer be used for transmission, but it doesn't break.