Managing hashtags submitted with an #ActivityPub note is not as simple as you'd think. Hashtags are collected into a separate node in the Note object.
Firefish and Friendica for example, have their hashtag entry below the content. You've got to do cartwheels to combine those with any a user may have added in the note text itself, removing duplicates.
Then ensure you maintain the integrity of the note text but also add any missing tags so they are visible to end users.
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