It seems Microsoft is keeping its promises after all, as the promised update for Xbox Music and OneDrive have arrived right on time.
The Xbox Music update offers bug fixes and General Performance Improvements, while the OneDrive update comes without a changelog, but presumably fixes the duplicate folder issue.
Unfortunately the Xbox Music app is still painfully slow resuming and loading libraries, while the OneDrive app does not unfortunately come with a transparent tile.
Find the apps at the links below.
Thanks Brandon for the tip.