Not sure what’s going on, but want to add what I observed.

1. I tried search on the https://lemmy.world/c/shortcuts, and !shortcuts@lemmy.world when I saw your post, that didn’t turn up the community, but turn up this post, and the community’s announcement.
2. Tried it 5-10 minutes later, the above two shows up, plus the community.

So, for my instance at least, I guess it could be:

1. Lag time to propagate new communities across federation
2. Glitch that got fixed over time