There's a problem downloading vertical videos at 4K too, it looks like it's downloading LQ videos and upscaling them to 4K.
Sample link:
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The 3840p 30fps MP4-Video AAC-Audio variant (actual downloaded resolution 2160x3840) is only 29.91 MB, the downloaded video looks like its a LQ 240p video stretched to fill 2160x3840 resolution.
The lower quality 2160p 30fps MP4-Video AAC-Audio variant (actual downloaded resolution 1216x2160) is 49.48 MB and looks much better.
If you play the 3840p variant, the video looks very bad, like its 240p?