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You're guess is as good as mine. I really wish there was a list in each instance for this reason. However, I've had the same issue before and I found that just searching at a different time fixes things.
Click the "Instances" link at the bottom of the page and it will show all the instances you're federated with and which ones are blocked. It looks like lemmy.world is federated with you, but no one from there has connected with your community yet, so that's why its not showing up.