help with OBB READ/WRITE_EXTENAL_STORAGE

So I'm not sure if this is a bug or not.

I heard Unity adds android:maxSdkVersion="18" to

Code (CSharp):

1. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >

because of this

https://developer.android.com/reference/android/Manifest.permission#WRITE_EXTERNAL_STORAGE

But when I call

Code (CSharp):

1. if (Permission.HasUserAuthorizedPermission(Permission.ExternalStorageWrite))
2. {
3. }

on API level 19 or greater Unity returns false. Is this right? because permission is implicitly granted if API level is 19 or greater. This also seems to mute RequestPermission popup.

So the only solution I could think of was something like this

Code (CSharp):

1. if(API < 19)
2. {
3.    check write permission
4.    if(can write external)
5.    {
6.      download OBB
7.    }
8.    else
9.    {
10.       request external write
11.       try to download again
12.    }
13. }
14. else
15. {
16.   download since permission implicitly granted
17. }

I'm doing this to handle edge cases when the user fails to download an OBB or their permissions are not correct which does happen in production.

Am I doing something wrong or is it a bug that HasUserAuthorizedPermission(UnityEngine.Android.Permission.ExternalStorageWrite) return false on API 19 or greater.