Trying to better understand how federation works - from reddthat, I can't see the pine tree and Siberian hogweed posts in the screenshot. Both those users are from instances that we're federated with.
Is it time based? I only joined that community today, and those posts are from days ago.
Edit: some hours later, I can now see those posts posts from this instance 🥳
I was able to get this to work by searching "[email protected]" in the all communities search tab, then searching "security"
Kinda convoluted, but hopefully the experience gets smoother in the future
Edit: deleted my other comment by accident and can't restore it lol
Yep that seems like the best way to do it at the moment. I'm not sure it will make it into v0.18 but there were some talks on the Lemmy admin matrix about it. Known pain point in the federation at the moment