I've just realised something, which I assume is down to imperfect federation between Friendica and Mastodon: When I reply to someone on Mastodon, it automatically includes a mention of them @name.whatever - but I don't see that mention. If it's a nested comment, multiple mentions might be included. I only realised this when someone asked to stop mentioning them in a thread, and didn't realise I had.
Is this intentional? Is there a way to not mention someone in a comment on their post (or a reply to a comment)? Thanks.