Thumbnail Failure

[debug] Command-line args: ['--cookies', 'cookies.txt', '--verbose', '--merge-output-format', 'mp4', '--write-thumbnail', '--embed-thumbnail', '--output', '[%(upload_date)s] %(title)s (%(id)s).%(ext)s', '--', 'https://www.youtube.com/watch?v=ACV-i-b10io']
[debug] Encodings: locale cp65001, fs mbcs, out cp65001, pref cp65001
[debug] youtube-dl version 2021.05.16
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.18362
[debug] exe versions: ffmpeg 2021-03-09-git-c35e456f54-full_build-www.gyan.dev, ffprobe 2021-03-09-git-c35e456f54-full_build-www.gyan.dev
[debug] Proxy map: {}
[debug] Default format spec: bestvideo+bestaudio/best
WARNING: Unable to download thumbnail "https://i.ytimg.com/vi/ACV-i-b10io/maxresdefault.jpg?v=6039625b": HTTP Error 404: Not Found