I’m not sure if this is a problem specifically with linux@lemmy.ml because I don’t follow any other lemmy.ml communities, but it’s been a month since the last post in there according to the Yiffit version of the community and yes, I’m filtering by new and if you go directly to the community in its instance there are a lot of new posts that never reach Yiffit.
I have another account in Dbzer0 and there are no federation issues with Lemmy.ml or at least with linux@lemmy.ml.
Lemmy.ml blocks Yiffit, I’m afraid. I’d consider looking for similar communities on lemmy.world instead.