Timestamp and upload_date extracted on Facebook are incorrect

[vira00]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.01.01
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

youtube-dl -v --get-filename -o %(timestamp)s.%(upload_date)s https://www.facebook.com/facebookapp/videos/587455038708591/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--get-filename', '-o', '%(timestamp)s.%(upload_date)s', 'https://www.facebook.com/facebookapp/videos/587455038708591/']
[debug] Encodings: locale cp950, fs utf-8, out utf-8, pref cp950
[debug] youtube-dl version 2020.01.01
[debug] Python version 3.8.0 (CPython) - Windows-10-10.0.18362-SP0
[debug] exe versions: ffmpeg git-2019-12-02-968c4cb, ffprobe git-2019-12-02-968c4cb
[debug] Proxy map: {}
[debug] Default format spec: bestvideo+bestaudio/best
1575570211.20191205

Description

The timestamp and upload_date extracted are the same as those of other videos uploaded before or after in the playlist.
Several months ago, the timestamp and upload_date extracted were correct.