I’ve had sources I just added yesterday not be searchable as well (oddly, it was 2 that it couldn’t find after a handful worked as normal). I waited overnight to see if it were just a cache issue, but it persists today.
Edit: I’ve also been having issues with a lot of stuff loading (updates on the home page, observation searches, and other things. They result in the same spinning wheel that I get if I search for my searches by a unique search term - I similarly receive fewer, though I don’t think as limited, results when I use a broader search term). I’m not sure if this all is related or not, but I wonder if there’s been increased use of the site with various stay-at-home orders. I’ll also be checking to see if any of what I have going on could be on my end.