When I go to https://musicbrainz.org/artist/create and type Akane in the "Name" field, I'm unexpectedly not seeing the usual "Possible duplicates" message with a checkbox. This is unexpected, since https://musicbrainz.org/search?query=akane&type=artist&method=indexed currently lists 9 artists with this name (some capitalized exactly the same).

I see the message when I type "A" or "Aka", but not when I type "Ak" or "Akan", even though all of those have duplicates.

I can see in DevTools that successful /check_duplicates calls are being made for all of these names, but the reply is just {"duplicates":[]} in the failing cases.