Kind of falls under the 'Too Afraid to Ask' category, I guess, but I've been curious about this for a while. Did something actually happen at some point, or was this just a procedural thing that wasn't ever followed up on?
It's mildly annoying given how large they are.
Edit: It's possible that this isn't a federation problem at all (as discussion is bringing to light) but something else entirely. Regardless, though, something is going on.
It's also possible that the site I link below is out of date, so maybe don't take that as gospel. I bookmarked it a year ago and just hit it up to check on this a few minutes before posting, so I haven't been keeping up with it.
Doing a little more digging in light of the above, it's possible this is related to this issue, and there's just an extremely long delay before we get content from lemmy.world. Weirdly, though, it doesn't seem to be the case with other instances - maybe because of their size? Either way, looking at the same posts on our instance and 3 or 4 others, we seem to be the only ones not getting the replies. So something's fucked, maybe.
If you're on lemmy.world and happen to see this, drop a reply in here, maybe - I'd be curious to see how long it takes for us to see it (or if we can at all).
This seems to be an unknown thing, because (by viewing this post on lemmy.world) I can see a reply from L.W. Go to the post on our instance, and you'll see what I mean.
If you check here, you can see who's blocking us currently.
Lemmy.world is one of a small handful of instances that explicitly don't federate with us, and we're one of 67 that lemmy.world blocks.
There's basically two furry instances (us and yiffit), and they aren't blocking yiffit, so it's not because furries, and we federate with them, so it wasn't a retaliatory measure, so I really don't know.
Edit: It's mildly annoying because due to the size of lemmy.world, it means we're not seeing a large percentage of replies in many popular communities. I guess the CTA here is, if there wasn't a reason for this, can we follow up with them and see what gives? Maybe it was a mistake at some point (or they thought we're something we're not, I don't know), and it could be fixed?
https://lemmy.world/instances The current list of federated instances shows us as still federated. The site you linked says the block was from a year ago, and I seem to recall there was a temporary block in place then for technical reasons.
Just to rule it out: You don't have the instance blocked in your personal blocklist, do you?
There's only one instance I have blocked, and it's not them.
I might be using the wrong terminology, but there's something going on. Do you see the lemmy.world user replying to this thread, from pawb?
I don't, no. I'm currently assuming it's just that there's delay due to server load or something - I can certainly see posts from Lemmy.world in my feed.
https://pawb.social/post/14011983
Maybe it's just catching up from the maintenance we had a few days ago?
If other instances are seeing and replying to posts from our instance on communities owned by our instance, but we aren't seeing the replies, that's something more fucked up than just delays from days-old maintenance, unless I misunderstand how this all works, which is also possible.