Unable to put STOP button - Android Auto - Legacy MediaBrowserServiceCompat

Hi I'm trying to put the stop button in the player screen and remove all other buttons:

mMediaSession = MediaSessionCompat(
                this,
                "MediaSessionCompat_TAG"
            ).apply {
                val sessionActivityPendingIntent =
                    packageManager?.getLaunchIntentForPackage(packageName)?.let { sessionIntent ->
                        PendingIntent.getActivity(this@AudioService, 0, sessionIntent, 0)
                    }
                setSessionActivity(sessionActivityPendingIntent)
                isActive = true
                setCallback(mediaSessionCallback)
                setPlaybackState(
                    playbackStateBuilder.apply {
                        setState(PlaybackStateCompat.STATE_STOPPED, C.TIME_UNSET, 1f)
                        setActions(PlaybackStateCompat.ACTION_STOP)
                    }.build()
                )
                setSessionToken(sessionToken)

            ...
            
            In addition I put in the MediaControllerCallback the value of stop

                
                @Suppress("PropertyName")
val EMPTY_PLAYBACK_STATE: PlaybackStateCompat = PlaybackStateCompat.Builder()
    .setState(PlaybackStateCompat.STATE_STOPPED, C.TIME_UNSET, 0f)
    .build()
    
        private inner class MediaControllerCallback : MediaControllerCompat.Callback() {

        override fun onPlaybackStateChanged(state: PlaybackStateCompat?) {
            playbackState.postValue(EMPTY_PLAYBACK_STATE)
        }

        override fun onMetadataChanged(metadata: MediaMetadataCompat?) {
            playbackState.postValue(EMPTY_PLAYBACK_STATE)
            nowPlaying.postValue(
                if (metadata?.id == null) {
                    NOTHING_PLAYING
                } else {
                    metadata
                }
            )
        }

        override fun onQueueChanged(queue: MutableList<MediaSessionCompat.QueueItem>?) {
            playbackState.postValue(EMPTY_PLAYBACK_STATE)
        }

        override fun onSessionEvent(event: String?, extras: Bundle?) {
            playbackState.postValue(EMPTY_PLAYBACK_STATE)
            super.onSessionEvent(event, extras)
            when (event) {
                NETWORK_FAILURE -> networkFailure.postValue(true)
            }
        }

I only get the PLAY button and periodically a blink show and hide the previous and next buttons