No audio output when CMAF & Multi-Key & Segmented mp4 are packaged.

Same question as [#10136](https://github.com/google/ExoPlayer/issues/10136).

1. No audio when I package Widevine content as [multi-key + Segmented mp4] and play it in Android Exoplayer (2.16.1). But if I package it as [multi-key + Single mp4] it outputs audio.
Why is there no audio output for content packaged as [multi-key + segmented mp4] in Exoplayer? Is there a way to output audio with this content?

2. In Exoplayer, segmented-VTT subtitles are not displayed.
Exactly, only the first segmented subtitles are displayed, not later.
How can I get segmented-VTT subtitles to be displayed?

[multi-key + Segmented mp4] content information.
When I download and play content in Exoplayer Demo, I have no audio.
```
[multi-key + Segmented mp4] content.
When I download and play content in Exoplayer Demo, I have no audio.

{
"name": "segmented/cmaf",
"uri": "https://contents.pallycon.com/DEMO/app/tears_of_steel-segmented/cmaf/stream.mpd",
"drm_scheme": "widevine",
"drm_license_uri": "https://license.pallycon.com/ri/licenseManager.do",
"drm_key_request_properties": {
"pallycon-customdata-v2": "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"
}
}
I would also like to know why the subtitles are not displayed.
```

I would also like to know why the subtitles are not displayed.