Notification from non-existent repository

[jonaski]

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Bug

Body

I've received notification from "ycombinatoor/ycombinator-co" in participating and mentioned which does not show up in unread and does not go away.

[lukstafi]

Same, except with a different set of typos in the repository name.

[fhars]

Same, with another nonexisting repo:

Looks like a data consistency issue in the anti-spam logic.

[lukstafi]

See the workaround here: https://github.com/orgs/community/discussions/6874#discussioncomment-14507162

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[inlann]

Same：