Property value of "base" in debugger

Question

I'm debugging the following code:

class A 
{
    public virtual string X => "A";
}

class B : A
{
    public bool OwnX { get; set; } = true;
    public override string X
        => OwnX ? "B" : base.X; // (o)
}

class Program
{
    static void Main() => Console.WriteLine(new B().X);
}

And I have a breakpoint on the line marked with (o). When the breakpoint hit, I'm trying to evaluate base.X and getting its value "B":

The question is: why not "A"?

Answer 1

This is a Roslyn bug

As others have mentioned, this bug is well known.

You can trivially check that the actual value of base.X is A, it is just the Expression Evaluator that returns the wrong result: