NUnit-Retry Not Retried

RetryTest1.cs

[TestFixture]
public class RetryTest
{
    private static int _count = 0;

    [Test]
    public void WontBeRetried()
    {
        if (_count++ >= 1)
        {
            Assert.Pass("It's been retried");
        }

        Assert.Fail(); // <--- Called, test fail. Not retried.
    }
}

RetryTest2.cs

[TestFixture]
public class RetryTest
{
    private static int _count = 0;

    [Test]
    [Retry]
    public void WontBeRetried()
    {
        if (_count++ >= 1) // <-- Called twice
        {
            Assert.Pass("It's been retried"); // <-- Called on the second time, test passed.
        }

        Assert.Fail(); // <--- Called once, but test pass because it's been run again after failure.
    }
}

RetryTest3.cs

[Test]
[Retry(times: 2, requiredPassCount: 2)] // Fails

RetryTest4.cs

[Test]
[Retry(times: 3, requiredPassCount: 2)] // Pass

RetryTest5.cs

[TestFixture]
[Retry]
public class RetryTest

TestResults2.xml

<results>
  <test-suite type="TestFixture" name="RetryTest" executed="True" result="Success" success="True" time="0.041" asserts="0">
    <results>
      <test-case name="NUnit_retry.Tests.RetryTest.WontBeRetried" executed="True" result="Success" success="True" time="0.001" asserts="0">
        <reason>
          <message><![CDATA[It's been retried]]></message>
        </reason>
      </test-case>
    </results>
  </test-suite>
</results>