Why am I getting an error when I attempt to subscribe to an outside community?

lemmy.world has been giving me issues all day, it is acting like they defederated but I'm wondering if there is some kind of technical hiccup that can act like a defederation and never goes back and gets the missing posts and comments. I really hope it can be fixed because this is a huge problem, and worsening as more servers fail to show up in search results and are having strange behavior. If it keeps going like this everyone is going to be stuck on whatever the biggest platform becomes and we're back to square one.