Various flags of visited countries don't show up in profile

In my profile (nomads.com/@rene) some flags don’t show up. This is due to a 404 error on the following URL(s): e.g. for San Marino https://nomads.com/assets/emoji_flag_fallback/sm.png?1

I’ve identified San Marino (SM) Equatorial Guinea (EQ) and Comoros(KM), but I suspect there might be more.

Screenshots: