To Reproduce:

1. Open the attached project and build it to iOS. Run, you should see MainSource.clip.samples value outputted every Update and it should be equal to -1 (the correct value is outputted when running in editor).

2. If you click "Fix it" the clip is Stopped and Played this should fix the issue, the correct value of samples should be outputted and the clip should start to play.

Note: This bug can only be reproduced once on a single device i.e if you play the app, close it and open it again the bug can it can still be reproduced. But if you build it again it can no longer be reproduced and the clip plays fine, you have to delete the app and restart the device to be able to reproduce it again.