Nokia 2.2 can't change ringtone

My Nokia 2.2 ignores ringtone changes. Although the new ringtone is shown in the settings, the ringtone is ignored when someone calls. Instead it uses the old Nokia Tune. It doesn't matter whether the new ringtone is a Nokia ringtone (e.g. Nokia Barbell or Nokia Stones) or an mp3 downloaded from the internet, the phone won't use the new ringtone.

Only ringtones set for a specific contact aren't ignored.