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I also had a problem with the @match variable, in my case I had to change it from http* to https, then added the code manually and it's working great!

added the code manually

In the last version of the tampermonkey making custom changes to a scripts disables their automatic updates. So if you are with tampermonkey I think you need now reenable updates for the script somewhere in settings. Also, any script updates will discard your changes in any script manager so far as I know

Just keep in mind

Forgot to mention I'm using Firefox + Greasemonkey v4.10, maybe that's related to the problem with the variable?

I'm using Firefox + Greasemonkey v4.10, maybe that's related to the problem with the variable?

Sounds likely, given that previous feedback indicates that Tampermonkey and Violentmonkey treat @match differently.
Thanks for letting me know -- I have updated the code according to your feedback (version 6.2), so hopefully it should now work by default for other Greasemonkey users.

Deleted and reinstalled, this time around it went smoothly, thanks for the quick update!
I don't know why Youtube people never bothered to add such functionality, I understand youtubers want us to watch the latest videos in their playlists and that's why they're always at the top, but when we start watching a playlist we never watched before, oldest to newest is the way to go, and this script makes ALL the difference!