That is odd Aaron - I’ve just tried the same search with the same result. Tried searching for an item of mine & it worked as normal.
There was a separate thread here where people were saying they couldn’t find their items… Where do my newly listed items go? - #18 by kimfolksy
I’m not sure if your issue is related, but it might be worth popping a comment on that thread in case it is. I think support are tagged in there too so hopefully they can let you know.