@BarryCarlyon: That’s correct.
To provide some more context: Originally, we were sending a USERNOTICE to each hosting channel and the hosted channel. This was scenario 3 that we removed. The problem was that the room-id tag always matched the room receiving the USERNOTICE instead of the room where the resub originated. We thought that was kind of a weird behavior and decided to remove it.
The feedback here about a target-room-id tag helped drive that decision, too. Now, we only send a USERNOTICE to the room where the resubscription is taking place, which should mean no more parsing of system-msg to decide if you care about the message.
If it isn’t working out that way, please let me know. 
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