It'd probably be easier for you to just ignore the additional @format, especially now that you know why it happens (even though it annoys you). Mastodon to Lemmy communication isn't seamless, but it's cool that it can happen at all

And nobody's gonna dig through settings to find a (probably non-existent) configuration that removes the blue links, when it's something they don't even see. Did you check your own config to see if it could remove the @'s from Mastadon replies?

Wayyyy easier to ignore your peeve and enjoy the upside of it all, imo

Or block? Idk, that would be a personal choice and feels counterproductive to me

Complete side note: I wonder if when a Mastodon user replies to a Lemmy comment that's nested (like 10+ replies deep), does it @everyone in the comment thread? Is there a limit? I need answers, but am too ambivalent to try