twitch clips. Link is not detected as [twitch:clips] but detected as [twitch:stream]

[em92]

• I've verified and I assure that I'm running youtube-dl 2018.09.10
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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Full verbose output:

$ youtube-dl -v https://www.twitch.tv/sergeynixon/clip/StormyThankfulSproutFutureMan
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.twitch.tv/sergeynixon/clip/StormyThankfulSproutFutureMan']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.09.10
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-6-amd64-x86_64-with-debian-9.5
[debug] exe versions: ffmpeg 3.2.12-1, ffprobe 3.2.12-1, rtmpdump 2.4
[debug] Proxy map: {}
[twitch:stream] sergeynixon: Downloading stream JSON
ERROR: sergeynixon is offline
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 502, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 573, in _real_extract
    raise ExtractorError('%s is offline' % channel_id, expected=True)
ExtractorError: sergeynixon is offline

$ youtube-dl -v https://clips.twitch.tv/sergeynixon/StormyThankfulSproutFutureMan
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://clips.twitch.tv/sergeynixon/StormyThankfulSproutFutureMan']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.09.10
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-6-amd64-x86_64-with-debian-9.5
[debug] exe versions: ffmpeg 3.2.12-1, ffprobe 3.2.12-1, rtmpdump 2.4
[debug] Proxy map: {}
[twitch:clips] StormyThankfulSproutFutureMan: Downloading JSON metadata
[twitch:clips] StormyThankfulSproutFutureMan: Downloading JSON metadata
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://clips-media-assets2.twitch.tv/AT-cm%7C308210985.mp4'
[download] RUN-308210985.mp4 has already been downloaded
[download] 100% of 13.93MiB

Description of your issue, suggested solution and other information

Identify https://www.twitch.tv/<user>/clip/<something> as [twitch:clips], not [twitch:stream]