fields like creator/artist are resolved as "NA"

[ilias-sp]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.06.16
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

[http_offline@greenhat-32 tmp]$ youtube-dl -v -f 140 https://www.youtube.com/watch?v=9vE-9vsjhFw -o '%(artist)s - %(title)s.m4a'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', '140', 'https://www.youtube.com/watch?v=9vE-9vsjhFw', '-o', '%(artist)s - %(title)s.m4a']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.06.16
[debug] Python version 3.8.3 (CPython) - Linux-5.6.16-300.fc32.x86_64-x86_64-with-glibc2.2.5
[debug] exe versions: ffmpeg N-83258-gd1df72a, ffprobe N-83258-gd1df72a
[debug] Proxy map: {}
[youtube] 9vE-9vsjhFw: Downloading webpage
[youtube] {18} signature length 109, html5 player 16a691a1
[youtube] {137} signature length 109, html5 player 16a691a1
[youtube] {248} signature length 109, html5 player 16a691a1
[youtube] {136} signature length 109, html5 player 16a691a1
[youtube] {247} signature length 105, html5 player 16a691a1
[youtube] {135} signature length 109, html5 player 16a691a1
[youtube] {244} signature length 105, html5 player 16a691a1
[youtube] {134} signature length 109, html5 player 16a691a1
[youtube] {243} signature length 109, html5 player 16a691a1
[youtube] {133} signature length 109, html5 player 16a691a1
[youtube] {242} signature length 105, html5 player 16a691a1
[youtube] {160} signature length 109, html5 player 16a691a1
[youtube] {278} signature length 109, html5 player 16a691a1
[youtube] {140} signature length 109, html5 player 16a691a1
[youtube] {249} signature length 109, html5 player 16a691a1
[youtube] {250} signature length 105, html5 player 16a691a1
[youtube] {251} signature length 109, html5 player 16a691a1
[debug] Invoking downloader on 'https://r8---sn-fpoqixaa5n-5uie.googlevideo.com/videoplayback?expire=1592278342&ei=5ujnXp2-K835-gbOk4TICA&ip=91.140.63.72&id=o-AIgWHH9xWwKaq4C7AbcQr1zHEbGH7VoiAE5_X-fZK3AU&itag=140&source=youtube&requiressl=yes&mh=6n&mm=31%2C29&mn=sn-fpoqixaa5n-5uie%2Csn-nv47lns6&ms=au%2Crdu&mv=m&mvi=7&pl=19&gcr=gr&initcwndbps=511250&vprv=1&mime=audio%2Fmp4&gir=yes&clen=4014235&dur=252.702&lmt=1532360665012532&mt=1592256632&fvip=3&keepalive=yes&c=WEB&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cgcr%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgB3jDAA61V07VfjwTOyzhgdBiF2oeREFvPB73A8moQgwCIHyjop8DRycBucULznvQLKK1aXLVpunoC1Qg9iaw6vrD&sig=AOq0QJ8wRgIhAIkmNWIjsFy3KMe2nvczUTiRvpnrynpm9y1YOwHhtsAlAiEAuoIjRgnWZbd5NIlhBPLHe3QrwLhXfIcRteH_qsT73WU=&ratebypass=yes'
[download] Destination: NA - Angel Of The Morning.m4a
[download] 100% of 3.83MiB in 00:02
[ffmpeg] Correcting container in "NA - Angel Of The Morning.m4a"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i 'file:NA - Angel Of The Morning.m4a' -c copy -f mp4 'file:NA - Angel Of The Morning.temp.m4a'
[http_offline@greenhat-32 tmp]$ 

[http_offline@greenhat-32 tmp]$ youtube-dl --version                                                                            
2020.06.16
[http_offline@greenhat-32 tmp]$ 

Description

Similar issue with #25677 that was closed a few hours ago, but for different fields, seems they cant be retrieved properly from Youtube.