Inherited Facts from public classes are not displayed properly

[mcliment]

Given this test case:

public class Calculator
{
    public virtual int Add(int x, int y)
    {
        return x + y;
    }
}

public class Calculator2 : Calculator
{
    public override int Add(int x, int y)
    {
        return x + y + 1;
    }
}

public class BaseFacts
{
    protected Calculator calc;

    public BaseFacts()
    {
        calc = new Calculator();
    }

    [Fact]
    public void Adds2()
    {
        var result = calc.Add(2, 2);

        Assert.Equal(result, 4);
    }
}

public class Facts : BaseFacts
{
    public Facts()
    {
        calc = new Calculator2();
    }

    [Fact]
    public void Adds3()
    {
        var result = calc.Add(3, 3);

        Assert.Equal(result, 7);
    }
}

Resharper test runner only shows two tests and actually there are three, as show in Visual Studio test explorer.
As a detail, Resharper briefly shows the inherited test at the beginning but it disappears and the test is in fact executed.