In this thread there was another post linked by the op:
https://lemmy.world/post/6323131
It opens in the browser instead of Boost which is kinda annoying (can’t vote, easily hide comments etc). Is there a way to open it in Boost? I already set all permissions to open Lemmy links in Boost.
It's due to the amount of URLs Boost needs to set itself as default for. There's Lemmy Redirect which can forward them to Boost: https://github.com/zacharee/MastodonRedirect
Edit: Huh, just tried it, that didn't work either with lemmy.world
It doesn't need to set itself as the default when the link is inside the app already. It just needs to recognize a link to a Lemmy instance.
It's a pain to setup, I had to use shizuku because the other methods would crash the app.