Min Vid does not work on "Watch Later" playlist on YouTube

[Multivax]

Whenever I try to open a video from my Watch Later playlist in YouTube, min vid just gets stuck on "Loading video from youtube.com". I believe this is an issue with the fact that the Watch Later playlist is always set on private, so min vid can't access the playlist.

[Softvision-CristinaBadescu]

I've managed to reproduce this issue using Min Vid v0.4.8 on latest Nightly build 60.0a1 (2018-03-04), on Windows 10 x64, Mac 10.12.6 and Arch Linux 4.12. Also, this behavior is reproducible for the videos from "Liked videos" section.
I don't think this issue is a regression since I've managed to reproduce it on Nightly 54.0a1 (Build ID: 20170123080351).
In the Browser Console I've noticed the following type error:

@meandavejustice, can you please take a look at this issue?

[danilose]

Need to be loged in on Youtube to see Watch Later playlist because it is private and you can't change that.

[NickMackz]

The same thing happens when trying to play from any private playlist.

Is there any workaround to this? I've tried allowing 3rd party cookies from YouTube, but that hasn't made any difference.