Cyrillic support for YouTube videos

Example link - https://www.youtube.com/watch?v=QvEXTCkX9Xg
4K shows an error it can/t be downloaded. I'm using the convert to mp3 feature. If I change the save filename to EN characters only it starts OK, but can't save it in the original name. My system fully supports cyrillic so it's on 4K side. 10x