I see lemmy.ml is on that list. Checking on a fairly active community there (c/linux) it looks like it got posts from yesterday but none of the 10 most recent ones from the past 22 hours are visible on fedia.io.
this post was submitted on 23 Nov 2024
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I just looked at these 3 on my PieFed server to see if maybe it's also seeing a similar issue, but all 3 mentioned Lemmy instances are federating fine and have all been seen within the past second here.
Weird, I know that I saw one comment from ani.social come in very delayed (like a couple of days) despite showing up on both the host [remote] instance and Mastodon.
Seeing this from SJW.
The ones you list in the title are all running 0.19.7
Ahhh, I hadn't considered that they might've upgraded since the last time Fedia pulled the versions (making the reported versions outdated, at least for lemmy), good catch!