PSA for MastoAdmins:
Did you know that Mastodon now has the ability to fetch missing replies from conversations?
Unfortunately you must enable this yourself by adding FETCH_REPLIES_ENABLED=true to your .env.production file.
So if you have updated your server to v4.4, you should seriously consider opting into this behaviour. Your users will thank you!
For full details and more settings to fine tune this behaviour see the docs:
https://docs.joinmastodon.org/admin/config/#fetch-all-replies