ConnectIQ 9.1.0: playbackPosition stuck at 0 and playback controls broken for AAC format in Audio Content Provider

ConnectIQ 9.1.0
Audio Content Provider app

Audio in AAC format plays successfully, but the playbackPosition does not change.
The Media.ContentDelegate.onSong() method always receives 0 in the playbackPosition parameter, regardless of any events.

Additionally, the following playback control buttons do not work:

This behavior is identical on both the simulator and physical devices.

The issue is specific to the AAC format. If the audio is in MP3 format, everything works correctly.