This feature is not in place to prevent or punish nym changes, but more to keep other users informed of the changes (assuring that it’s the same nym they knew before) … cause people DONT think to double check npubs or Nip05 addresses and wonder “why is this person in my timeline?”.
If that's the purpose, how long does the notice stay on before going away permanently?
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Until you dismiss (x) the notification.
it stays until you tap the 🅧 next to it
That's very good then. Checks out!