It is not interesting at all, it is a bug and clients are doing feature-creep bloating the protocol by accomodating for invalid tags. Please don't do this #[1] #[3].

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Oh the tag is invalid? How so

No, there is no tag. There is just a string "@npub...", which should not be considered a tag by clients.

Ah I see.

This is why you shouldn't do it: #[4]