Youtube not finding bestaudio on some videos

[itsnotoger]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.01.01
• 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 issues including closed ones

Verbose log

.\youtube-dl.exe -f bestaudio -v jdYJf_ybyVo
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestaudio', '-v', 'jdYJf_ybyVo']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2020.01.01
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17134
[debug] exe versions: ffmpeg git-2020-01-01-7b58702, ffprobe N-82889-g54931fd
[debug] Proxy map: {}
[youtube] jdYJf_ybyVo: Downloading webpage
[youtube] jdYJf_ybyVo: Downloading video info webpage
[youtube] {18} signature length 104, html5 player vflLL20EX
[youtube] {136} signature length 104, html5 player vflLL20EX
[youtube] {247} signature length 104, html5 player vflLL20EX
[youtube] {135} signature length 104, html5 player vflLL20EX
[youtube] {244} signature length 100, html5 player vflLL20EX
[youtube] {397} signature length 104, html5 player vflLL20EX
[youtube] {134} signature length 104, html5 player vflLL20EX
[youtube] {243} signature length 104, html5 player vflLL20EX
[youtube] {396} signature length 104, html5 player vflLL20EX
[youtube] {133} signature length 104, html5 player vflLL20EX
[youtube] {242} signature length 104, html5 player vflLL20EX
[youtube] {395} signature length 104, html5 player vflLL20EX
[youtube] {160} signature length 100, html5 player vflLL20EX
[youtube] {278} signature length 104, html5 player vflLL20EX
[youtube] {394} signature length 104, html5 player vflLL20EX
[youtube] {140} signature length 104, html5 player vflLL20EX
[youtube] {249} signature length 104, html5 player vflLL20EX
[youtube] {250} signature length 100, html5 player vflLL20EX
[youtube] {251} signature length 100, html5 player vflLL20EX
[youtube] {256} signature length 104, html5 player vflLL20EX
[youtube] {258} signature length 100, html5 player vflLL20EX
[debug] Invoking downloader on 'https://r1---sn-4g5e6nzl.googlevideo.com/videoplayback?expire=1578174074&ei=GrIQXrO2LcLb1gLY17HYBA&ip=2003%3Adc%3Aef48%3A3b16%3A914e%3Afd40%3A8577%3A1e1b&id=o-AASgc0e3w-T7zEQFWItmW25-qCL7cUvCl7XcR-kk_SCG&itag=258&source=youtube&requiressl=yes&mm=31%2C26&mn=sn-4g5e6nzl%2Csn-i5heen7l&ms=au%2Conr&mv=m&mvi=0&pl=35&initcwndbps=1177500&mime=audio%2Fmp4&gir=yes&clen=35131176&dur=724.693&lmt=1547765945696549&mt=1578152375&fvip=1&keepalive=yes&fexp=23842630&c=WEB&txp=5511222&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&lsparams=mm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AHylml4wRAIgGVIJwybHE9Lh023L23upmmNHXOnk2Mpxhd-X0SnSArcCIBg41C-nc2WTfFKq7mMtORl-gJHHftl5qScnPDqtFXBD&sig=ALgxI2wwRAIgKb98FXeHdcZTYb4xJXfil7HTMrhSQb4HswJ8gDZDI48CICd7-CfGiy98lUj-X4A0ehwvGLKh65RWeCr1ly5X47hw&ratebypass=yes'
[download] Destination: OCEAN - John Butler - 2012 Studio Version-jdYJf_ybyVo.m4a
[download] 100% of 33.50MiB in 00:03
[ffmpeg] Correcting container in "OCEAN - John Butler - 2012 Studio Version-jdYJf_ybyVo.m4a"
[debug] ffmpeg command line: ffmpeg -y -loglevel "repeat+info" -i "file:OCEAN - John Butler - 2012 Studio Version-jdYJf_ybyVo.m4a" -c copy -f mp4 "file:OCEAN - John Butler - 2012 Studio Version-jdYJf_ybyVo.temp.m4a"

Description

On the video used above, and a few others I've found, the bestaudio option fails to detect the presence of the webm 160K opus option, and instead falls back to the second best m4a aac 128K option (which by the way with -x converts to horrible 5K opus audio). Also if I run opus instead of bestaudio, it doesn't find anything.

If I run bestaudio[ext=webm] or bestaudio[acodec=opus], it does however find the best quality. On the vast majority of videos those bracket options are not needed though, which is very misleading.