Unable to search for photo caption

Just recently (2-3 says ago) searching for photos by caption text has started being really finicky. Searching for “End of geotagging” returns no results even if that caption does exist. Searching “geotag” returns 40 results (also doesn’t include “End of geotagging”), and changing it to “No geotag” reduces it to 37 results, even though all 40 pictures have the same caption of “No geotag”.