Playback stalls forever in buffering with "Music Choice" content tunneling

### Content description
The content is a stream generated from Music Choice channels (often found in cable broadcast). What happens is playback stalls in buffering state, the video renderer is stalled (`Renderer.isReady()` reports false because the sample queue has been completely read) but no more video segments loads are kicked off (`LoadControl` does not request loading).

I've only reproduced this on Broadcom STB hardware (Broadcom BCM7271 based) with tunneling on.

### Link to test content
Provided by email.

### [REQUIRED] Version of ExoPlayer being used
Dev-v2-2.10.4 (sha d1ac2727a)

### [REQUIRED] Device(s) and version(s) of Android being used
Android P on an Evolution eSTREAM STB.

### [REQUIRED] A full bug report captured from the device
Provided by email.