2160p Ultra HD videos on YouTube are not visible to 4K Downloader. Both Smart Mode and `dull mode` can't detect the 4K version of the video. Only 2K version is available for download. Can you please fix this?

Video linked below is playable as 4K on Youtube but 4kD can't grab it.
Example 4K video;
https://www.youtube.com/watch?v=23sJc08AdOg

It's a UHD video but it's detected as 2K by 4kDownloader.