Some federated communities not appearing in search

When I search for a community that exists on lemmy.ml by going to Magazines>Search, some of them aren't showing up.

For example, I want to add gis@lemmy.ml. I've tried searching for just "gis" and for "gis@lemmy.ml". Neither show that community. The same goes for powerlifting and hamradio.

The first two are newer communities, made within the last week. the hamradio community, I think is newer as there aren't a ton of posts.

Is this just a case of the servers not being "caught up" yet?