I have the same issue.
@Cathal_S, thanks for the help.
@JojoD, @johnlisle, our team is aware about sleep timers that aren’t working for turning off music at the specified time and are still working on a fix. For news and updates about sleep timers, keep an eye on the recommended answer on the main thread. If you have any other questions or concerns, feel free to start a new one for I will be locking this thread after 24 hours.