Automatic captions aren't downloaded from some YouTube videos

[fin-atem]

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Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--ignore-config', '-i', '--skip-download', '--all-subs', '--write-auto-sub', '--external-downloader=aria2c', '-v', 'https://www.youtube.com/watch?v=S5eHkoRQHnY']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.08.28
[debug] Python version 3.7.0 (CPython) - Darwin-17.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.0.2, ffprobe 4.0.2
[debug] Proxy map: {}
[youtube] S5eHkoRQHnY: Downloading webpage
[youtube] S5eHkoRQHnY: Downloading embed webpage
[youtube] S5eHkoRQHnY: Refetching age-gated info webpage
[youtube] S5eHkoRQHnY: Looking for automatic captions
WARNING: Couldn't find automatic captions for S5eHkoRQHnY
[debug] Default format spec: bestvideo+bestaudio/best

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Description of your issue, suggested solution and other information

on most youtube videos i try to download the automatic captions for, it usually downloads them with no issue. however, with this video in particular youtube-dl claims that there aren't any automatic captions, which is entirely false. i even have a screenshot to further prove my point here. not sure why this one video youtube-dl struggles with.

[fin-atem]

here's another video youtube-dl claims doesn't have automatic captions, when it definately does. (nsfw title and contains vulgar language in that video)

[MiNH0]

It is definitively a problem with age-restricted/age-gated videos only. In actual version "2019.04.30" it is still not working. But for anyone interested, there is a workaround - download using JDownloader2.