System.Diagnostics.Process redirect causes IOException only in Unity .NET 4.X

Attached is a recreation of the bug. This error only occurs when Unity is set to .NET 4.X and runs fine in .NET 3.5

To trigger the bug press the menu item in the top menu.



Expected Output In Debug Console:
Hello World

Actual Output:
IOException

Code (CSharp):

1. using System.Diagnostics;
2. using UnityEditor;
3. using UnityEngine;
4. using Debug = UnityEngine.Debug;
5.  
6. public static class Program
7. {
8.     [MenuItem("BUG REPORT HERE/Reproduce Bug")]
9.     public static void Bug()
10.     {
11.         var _process = new Process {
12.             StartInfo = {
13.                 FileName = "echo /c",
14.                 Arguments = "hello world",
15.                 WorkingDirectory = ".",
16.                 CreateNoWindow = true,
17.                 RedirectStandardOutput = true,
18.                 RedirectStandardError = true,
19.                 UseShellExecute = false,
20.             }
21.         };
22.         _process.Start();
23.         _process.WaitForExit();
24.         Debug.Log(_process.StandardOutput.ReadToEnd()); // IOException      
25.     }
26. }
27.  

 

same error on process.StandardError.ReadLine();