I don't know if this really answers the questions, but I had a similar problem with endless loading.
Basically, I would like to play the video using a fragment of the player, exit the video, and then the next video that I would try to play will display an infinite download indicator.
This problem has occurred only on some devices.
Since I used the latest version of apt youtube, I updated the youtube application on problem devices and it seems to have solved the problem.
I know that โupdating the YouTube appโ is not a great answer, but it fixed the odd problems I was experiencing.
Hope this helps.
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