Detect if music is playing in other apps on Android

I'm trying to detect whether music is playing in any other apps (Which should mute my game's music).

(AudioManager)UnityPlayer.currentActivity.getSystemService(Context.AUDIO_SERVICE).isMusicActive seems to always return true.

I made a native plugin which works, in so far that it returns a value, but it's always true. Am I missing something?

 package com.glitchnap.glitchandroid;
 import android.os.Bundle;
 import android.util.Log;
 import android.content.Context;
 import android.media.AudioManager;
 import com.unity3d.player.UnityPlayer;
 public class GlitchAndroid {
 
     public boolean isMusicPlaying() {
     Log.i("GLITCHANDROID", "isMusicPlaying?");
     AudioManager aMan = (AudioManager)UnityPlayer.currentActivity.getSystemService(Context.AUDIO_SERVICE);
     return aMan.isMusicActive();
 }
 
 }