MediaManager changes "-" to "sub" while using public id of image in overlay method

When passing a public id `products:wO_ieThMSrGaI8c-_swfzw-0000000000` in the overlay method like in the code snippet given

```
Transformation x = new Transformation();
Log.d("SEEHERE", "addTagsOverlay@@@: " + x.generate());
x.overlay(alteredPublicId);
Log.d("SEEHERE", "addTagsOverlay$$: " + x.generate());
```

Which gives me an output of
```
07-30 18:55:46.686 9350-9350/com.marsplay D/SEEHERE: addTagsOverlay@@@:
07-30 18:55:46.687 9350-9350/com.marsplay D/SEEHERE: addTagsOverlay$$: l_products:wO_ieThMSrGaI8csub_swfzw-0000000000
```

Which alters the public Id of the image I've passed before. ( **-** changes to **sub** in the string)