### Version Media3 1.6.0 ### More version details _No response_ ### Devices that reproduce the issue device independent ### Devices that do not reproduce the issue _No response_ ### Reproducible in the demo app? Yes ### Reproduction steps 1. Play the playlist sent via email. This playlist consists of two live dash channels. 2. Activate subtitles on the first channel. 3. Block subtitles stream of the first channel via proxy and wait until it runs into a stream error and subtitle track will be disabled 4. Switch to the second channel. 5. Activate subtitles ### Expected result Second channel can be played without issues with activated subtitles. ### Actual result Playback freezes, because the subtitle track with an empty cue never gets ready. ### Media playlist will be sent via email ### Bug Report - [ ] You will email the zip file produced by `adb bugreport` to android-media-github@google.com after filing this issue.