m/dance was created very recently on kbin.social and has only a few posts. Still, if I search for its URL on lemmy.world it is visible and I can subscribe, though I can’t see any of the posts: https://lemmy.world/c/dance@kbin.social

I recently created the community c/survey_polls on lemmy.world, but when I search for it on kbin.social it is not visible. I can see the cross-posts I made on c/general and c/newcommunities, and looking at my profile through kbin.social my first post to c/survey_polls also doesn’t seem to be visible.

My point is, what communities/posts are or aren’t visible across lemmy.world and kbin.social? Do posts from one website only appear on the other if the community already has subscribers? Or is there some sort of time threshold?

Edit: To add to this, when looking at the post through lemmy.world you see 1 comment, while on Kbin there are 3.

Also this edit is apparently not visible on Kbin. I’m even more confused now.