for some reason posts and comments from sopuli.xyz and sh.itjust.works users have not been federating to kbin.social for the last 2 days. if you want to see all the posts from communities on lemmy instances or at least sopuli.xyz you need to click the browse original instance banner at the top of the magazine

Kbin also seems to be blocking bots for some reason, there is PetrosianBot on this community that isn't appearing on kbin

edit
that was a bit pointless, pinning the post only works on the same instance

edit 2
To clarify:
even though this community is on sopuli.xyz it still seems to be federating, but if a user from sopuli or sh.itjust.works makes a comment/post here it won't appear on kbin. id a user from lemmy.world, lemmy.antemeridiem.xyz, etc makes a comment/post it will be visible, like this post is

It's not just !anarchychess@sopuli.xyz it seems to happen on all lemmy communities. I found a post on lemmy.world and all the comments from sh.itjust.works users are missing.
if it was only sh.itjust.works not federating it might be a blacklist but supoli.xyz seems like an odd one to get blacklisted. lemmy.theonecurly.page also seems to not be federating with kbin, I seem no reason why that would be blacklisted either

edit 3
I found a pattern, all the not federating instance are on lemmy 0.18.0
federating:
lemmy.world: 0.17.4
beehaw.org: 0.17.4
lemmy.antemeridiem.xyz: 0.17.4

not federating:
sopuli.xyz: 0.18.0
sh.itjust.works: 0.18.0
lemmy.theonecurly.page: 0.18.0

edit 4
someone already opened a github issue that is probably the same issue

edit 5
It's over! sopuli.xyz has just updated to 0.18.1 and kbin federation is working again