Search missing things that have already been federated?

I’m not totally sure if this is a Piefed issue or a Blahaj server issue, so sorry if it’s the wrong spot for this.

I’ve noticed that when I try to search for things, the results I get aren’t as expected. If I don’t select to search a community, post, or comment, I get nothing. Searching for posts or comments also pretty frequently gets me nothing.

Random example: just searching ‘signal’ gets me nothing on both posts and comments, along with nothing if I select nothing. But if I search under communities it gives me a community that is already federated and has threads and comments about Signal.