Verbose string appears in dumped JSON.

[MishaIsay]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2019.03.18. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2019.03.18

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• Searched the bugtracker for similar issues including closed ones
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Command (PowerShell): $JSON = .\youtube-dl.exe -v --dump-single-json https://www.youtube.com/watch?v=9oCnPGoX6dU
Same happens in CMD: youtube-dl -v --dump-single-json https://www.youtube.com/watch?v=9oCnPGoX6dU >JSON.txt 2>verbose.txt
Printed output:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--dump-single-json', 'https://www.youtube.com/watch?v=9oCnPGoX6dU']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2019.03.18
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18855
[debug] exe versions: ffmpeg N-93395-g15d016be30, ffprobe N-93395-g15d016be30
[debug] Proxy map: {}

JSON content:

[debug] Default format spec: bestvideo+bestaudio/best
{"height": 1080, ... }