Play Version on ChromeCast doesn't work
There is no way to have the chromecast play the version of some media you want it to play.
No mather what you pick in the play version menu, it will always choose the first one to play, when casting to a chromecast.
This has been tested in the web client, as well as on the Android app.
Even if you start the media on your device, pick the version you want, and then cast, it will pick the first option.