My changeset comment was completely wrong. Sorry for the noise.

If you try to execute the following request in overpass-turbo, you'll get all the country capitals of the world.
Yesterday, only some capitals from South America were missing.
If I don't use the "admin_level" filter, I get way too much nodes back.

[out:json]
[timeout:25]
;
(
node
["capital"="yes"]
["admin_level"="2"];
);
out body;
>;
out skel qt;