The new Search Subeta page's Pet Name search had been really wonky since they rolled it out, not always showing relevant names and not differentiating between duplicate names easily, and then seeming to be missing a lot of pets in the search results; but now nothing comes up at all when I search specific names, just the "Nothing found." message. Is it broken, or disabled? Is there a thread already about it? I've looked around but haven't found anything so far.

It seems to be broken at the moment. There are two related threads down the page a bit. I know it was previously iffy on the results, but now nothing shows up for me.

search for a pet? & search user ?

it has been broken pretty much since they changed it to "accommodate" non-unique names. frankly i'm not sure why they couldn't have left it working the old way—simply taking you to a page displaying all results that match or contain your search criteria—but maybe there's something about the way non-unique names are stored that would have made that impossible. so yeah, it is unfortunately unusuable.