Awesome that this project is being continued!
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I've had this issue with an older version from December and hoped it got fixed with the current 13.07.55, root version, non-magisk, API21, arm64. Unfortunately, it's still existent in this version.
When I listen to videos with locked / turned off screen, the playback would always just stop after 2 or 3 videos. When I wake my phone up (just wake up, not unlocking it), then the playback would continue again.
Is this a known issue?
EDIT: Nevermind, I just found the latest thread. I'll ask there.