This is a weird one.
The first time you enter the music frame, everything is fine. The second time you enter it, it will play the same file twice, but only one instance can be controlled. Even with "Play sounds over frames" disabled, the uncontrollable instance will follow you from frame to frame. This is caused by the "Resume all sounds" action in event 6 of the second frame.
Unticking "Load all data at start" eliminates the problem, but obviously results in slower load times.
This does not happen on the Windows and Android runtimes. Tested on XB1 with different target versions and different VS2017 versions. Fusion version is 291.6.
I'll be looking for a workaround soon, but this really is a problem.