Because it's not an MP3 file. It's Webm container with opus audio.
$ youtube-dl --extract-audio --audio-format mp3 "https://youtu.be/Sqk3B2041uk";
--output test.mp3
[youtube] Sqk3B2041uk: Downloading webpage
[download] Destination: test.mp3
[download] 100% of 2.07MiB in 00:01
[ffmpeg] Post-process file test.mp3 exists, skipping
$ gst-typefind-1.0 test.mp3
test.mp3 - audio/webm
** Changed in: rhythmbox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1836459
Title:
Rythmbox fails to read mp3 tags
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