On the default Android ExoPlayer backend the native core never emits a speed property, so PlayerState.rate stayed at 1.0 forever: the speed sheet checkmark, keyboard speed stepping, long-press 2x restore, and media-session rate all computed from a stale 1.0. setRate now mirrors its value into state like setVolume already did.
On mpv backends, a selected --secondary-sid subtitle later in track-list order overwrote the primary selection because parsing ignored main-selection; the track sheet then badged the secondary as primary and replaced the user's primary on tap. parseTrackList now treats main-selection 0/absent as primary and 1 as the secondary selection.
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