Error parsing XML string with attributes usign XMLDocument when built on WebGL

 public class SpikeTest : MonoBehaviour
 {
     public const string DefaultString1 =
         @"<NodeOne><NodeTwo/></NodeOne>";
 
     public const string DefaultString2 =
         @"<NodeOne><NodeTwo attr='hello'/></NodeOne>";
     
     // Use this for initialization
     void Start () 
     {
         using(var responseReader = new StringReader(DefaultString1))
         {
             using(var xmlReader = new XmlTextReader(responseReader))
             {
                 var xmlOutcome = new XmlDocument();
                 xmlOutcome.Load(xmlReader);
                 var item = xmlOutcome.GetElementsByTagName("NodeTwo");
                 Debug.Log("NodeTwo first: " + item[0].LocalName);
             }
         }
 
         using(var responseReader = new StringReader(DefaultString2))
         {
             using(var xmlReader = new XmlTextReader(responseReader))
             {
                 var xmlOutcome = new XmlDocument();
                 //Fails here.
                 xmlOutcome.Load(xmlReader);
                 var item = xmlOutcome.GetElementsByTagName("NodeTwo");
                 Debug.Log("NodeTwo second: " + item[0].LocalName);  
             }
         }
     }
 }

The above code fails when it tries to parse "DefaultString2". Note how "DefualtString2" has an attribute compared to "DefaultString1". This happens when I build the game on the WebGL platform with no exceptions. Enabling exceptions in the build does not throw the error or catch any either. We need the game to run with all the exception flags.

Note: The exception thrown is "A exception has occured, but exception handling has been disabled in this build..." As I mentioned before Enabling exceptions does not help as the exception is not thrown in the latter case.