Thanks for the direct link to provide feedback. This problem is not currently solved at all.
Please keep it open, or shall we open another discussion on this?
It's extremely frustrating that a commercial push to drive people to subscribe into Apple Music disabled this functionality on purpose. It seems to be available only when you make Music offline and to rely on the songs that you have in your iOS device Library, which is very limited by the way, most is us have Libraries bigger than what the largest iPhone capacity is.
Please fix this soon, seems to be very simple to enable what was available since many years ago, and what we used to love about the Apple experience.