Adding a track to either the “Up Next” or “Queue” list using either the “Add Next” or “Add Last” function causes the queue to be deselected as the song source. A previously selected playlist becomes the source instead of the queue.
Welcome to our Community and thanks for bringing this to our attention. I’ve just reproduced this bug on our devices here, and I’ve sent all of this information to our Development Team for further investigation. I’ll keep you posted as soon as I have any updates.