Unexpected IInvalidOperation for ref returning property as a target of member initializer

[AlekseyTs]

        [Fact]
        public void Test()
        {
            string source = @"
public class C
{
    public static void Main()
    {
        var c = new C() { [1] = 2 };
        System.Console.WriteLine(c[1]);        
    }

    int _test1 = 0;    
    ref int this[int x]
    {
        get => ref _test1;
    }
}
";

            var comp = CreateCompilation(source, options: TestOptions.DebugExe, targetFramework: TargetFramework.StandardAndCSharp);

            CompileAndVerify(comp, expectedOutput: "2").VerifyDiagnostics();

            var tree = comp.SyntaxTrees.Single();
            var model = comp.GetSemanticModel(tree);

            var elementAccess = tree.GetRoot().DescendantNodes().OfType<ImplicitElementAccessSyntax>().Single();
            var propertyRef = (IPropertyReferenceOperation)model.GetOperation(elementAccess);
        }

Observed:

System.InvalidCastException : Unable to cast object of type 'Microsoft.CodeAnalysis.Operations.InvalidOperation' to type 'Microsoft.CodeAnalysis.Operations.IPropertyReferenceOperation'.

Expected:
No errors. This is a success scenario, there should be no IInvalidOperation in the tree.

Should check VB behavior as well.