So I posted ("tooted") a thing with a wrong link in it, someone commented on it while it was wrong, I replied to their comment with the right link, then I delete-and-redraft'ed the original to give it the right link (qoto isn't on v4 yet I guess?) and now I can't find the old comment so make sure the person got the right link (it doesn't appear in my notifications anymore, for instance).
I know, they will survive. :) But I realize I haven't internalized the rules of mastodon enough yet to understand exactly what happened to what after I did the things.