Okay, it’s my personal A-D site that isn’t working for Geonames. Tried my Rebbes site and it’s working. Both Safari and Firefox. Worked fine up until this current session (last session was October 1, 2020)
Is your A-D site using the same kiwitrees database as your Rebbes site? If not, then you just need to apply the same updated file (autocomplete.php).
If it is, then I don’t understand the issue well enough yet. Can you add anything more, specifically for that site. Perhaps let me access it temporarily?