Downloads wrong subtitles extention with "--skip-download" argument on Youtube

[F5System]

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I use the latest version 2017.01.08
I want to download Youtube's auto generated subtitles without downloading video in .SRT format. When I download subtitles+video — everything work correct. When I add "--skip-download" to skip video download, subtitles download in .VTT format (default for Youtube).

Here is my command in .bat file which download's wrong .VTT format
"C:\Program Files\youtube-dl.exe" --skip-download --write-auto-sub --sub-lang en --convert-subs srt --output "D:_YOUTUBE\AUTOGENERATED_%%(title)s.%%(ext)s" --download-archive "D:_YOUTUBE\archive.txt" "https://www.youtube.com/playlist?list=PLBr3GJrGh9o08Aibs53_qPBFq3QBQf98O"

If I remove "--skip-download" then it downloads .SRT as expected.

[F5System]

Sorry, looks like this is a copy of this problem
#9073

[dstftw]

Duplicate of #9073.