Geocoding Yandex with country code doesn't work

I re-rolled the patch to 8.x-4.x

Reroll the patch to 8.x-4.10

Feel free to keep and refer to this issues patches for your personal cases. but I don't see any clear evidence to commit this issue patch to dev branch.
May be this affects only the Yandex Geocoder (?).
As the Country code should work perfectly fine with OpenstreetMap Geocodeing: https://wiki.openstreetmap.org/wiki/Nominatim/Country_Codes

Please re-open this with evidence that I am mistaken (and this can indeed solve (and not introduce regressions in) general purposes.