Age-restricted videos not downloading for YouTube

[sdan41517]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.05.16
• 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 issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-J', u'https://www.youtube.com/watch?v=_OsRPWRJ7PY']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.05.16
[debug] Python version 2.7.17 (CPython) - Linux-4.15.0-132-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: none
[debug] Proxy map: {}
WARNING: unable to download video info webpage: HTTP Error 404: Not Found
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/__init__.py", line 475, in main
    _real_main(argv)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/__init__.py", line 465, in _real_main
    retcode = ydl.download(all_urls)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 2069, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 808, in extract_info
    return self.__extract_info(url, ie, download, extra_info, process)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 1502, in _real_extract
    }, fatal=False)),
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/compat.py", line 2644, in compat_parse_qs
    encoding=encoding, errors=errors)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/compat.py", line 2614, in _parse_qsl
    pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
AttributeError: 'bool' object has no attribute 'split'

Description

For the past few days, age-restricted videos are not working when downloading with youtube-dl or using the JSON dump command. One such video is https://www.youtube.com/watch?v=_OsRPWRJ7PY.

Please take a look.