Emojis (including flags) Blocked in Profile Location

I tried adding a flag emoji to the location field of my GitHub profile, but it is blocked with the following message:

Profile location contains unicode characters above 0xffff

Emojis work just fine in the main profile field, but not in the location field. I think flag emojis in particular are quite appropriate for the location field since they provide a visual/concise way to express location.

Can emojis (particularly flags) be allowed in the location field?