[youtube] age-gated extraction doesn't work

[nao20010128nao]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.07.28
• 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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'xJy24aN86Yc']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version Thu Aug  6 03:13:53 UTC 2020
[debug] Python version 3.8.5 (CPython) - Linux-4.15.0-108-generic-x86_64-with-glibc2.2.5
[debug] exe versions: ffmpeg 3.4.8, ffprobe 3.4.8
[debug] Proxy map: {}
[youtube] xJy24aN86Yc: Downloading webpage
ERROR: xJy24aN86Yc: YouTube said: Unable to extract video data
Traceback (most recent call last):
  File "/home/lesmi/.linuxbrew/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 798, in extract_info
    ie_result = ie.extract(url)
  File "/home/lesmi/.linuxbrew/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/lesmi/.linuxbrew/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1893, in _real_extract
    raise ExtractorError(
youtube_dl.utils.ExtractorError: xJy24aN86Yc: YouTube said: Unable to extract video data

Description

Due to recent layout change, age-gated detection was failing. This caused YouTube said: Unable to extract video data without age-gated refetching.