Apple Music Users Report Unrecognized Playlists in Music App

Multiple users have reported strange playlists appearing in their Music app that they do not recognize.
In some cases, these unknown playlists have been merged with user’s existing playlists, while in other cases, user’s playlists have gone missing or been replaced.
The issue is likely caused by an unspecified problem with Apple’s iCloud server.
Unsyncing and re-syncing iCloud for the Music app has worked for some users, but not all.
The issue is only occurring in the Music app for iPhone, and user reports date back to mid February.
Some users have contacted Apple support, but none have reported success.
The issue is reminiscent of another iCloud bug in which some users reported videos and images from strangers appearing in their Photo Libraries.