Offline Playlist - Not Playing Next Song Automatically

I have an Apple Watch SE, and iPhone 13. About three weeks ago, when playing an offline playlist from the watch (while I am out on a run), the playlist stopped moving forward to the next song automatically. I can still force it forward, and it plays the next song fine. But, as soon as that song ends, it doesn't go onto the next one.

I have cleared cache, updated both devices, deleted/reinstalled the apps, deleted/re-downloaded the playlist. My searching has not found a similar issue, or, at least there are enough offline Spotify issues that none seem to fit this description.

Any ideas on what I can do to fix this?