Fix `Update` importing old previously-unknown activities and treating them as recent ones (#36848) by ClearlyClaire has been merged! https://github.com/mastodon/mastodon/commit/ed3710e58f2398cabb677a67daa5ec9912647387
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RE: https://vmst.io/@mergebot/115537656505836666
One Encyclia alpha tester asked about a situation where making a trivial change to an old publication would insert it at the top of the followers' feeds.
This appears to have been an unintended behavior in Mastodon, where a federated update to an old object would appear as new if the object was not known to the Mastodon server beforehand.
Going by the below Mastodon code change, this problem should be fixed in Mastodon 4.6.