Incorrect RunningSum over Report with Group when not Visible in some Details

I have a Report with Groups and in some specific Details I want display a Running Sum over all Details.

I place a Label, configure the Running Sum, configure the Visible Property with an Expression.
From the 2nd Group the Label (SumB5) displays the wrong Value.

Actual Output:

Code
Group A
1:10       SumA1:10
2:10       SumA2:20    SumB2:20
3:10       SumA3:30
Group B
4:10       SumA4:40
5:10       SumA5:50    SumB5:40

Expected Output:

Code
Group A
1:10       SumA1:10
2:10       SumA2:20    SumB2:20
3:10       SumA3:30
Group B
4:10       SumA4:40
5:10       SumA5:50    SumB5:50

C#
[TestClass]
public class UnitTest1
{
    public class Item
    {
        public int ID { get; set; }
        public string Group { get; set; }
        public decimal Price { get; set; }
        public int ShowRunningSum { get; set; }
    }

    [TestMethod]
    public void TestMethod1()
    {
        var data = new[] {
            new Item {ID = 1, Group="A", Price = 10},
            new Item {ID = 2, Group="A", Price = 10, ShowRunningSum=1},
            new Item {ID = 3, Group="A", Price = 10},

            new Item {ID = 4, Group="B", Price = 10},
            new Item {ID = 5, Group="B", Price = 10, ShowRunningSum=1},
        };

        var rpt = new XtraReport {
            Bands = {
                new GroupHeaderBand {
                    GroupFields = {new GroupField { FieldName = "Group" } },
                    Controls = {
                        new XRLabel{ExpressionBindings = {new ExpressionBinding(nameof(XRLabel.Text), "'Group ' + [Group]") }}
                    }
                },
                new DetailBand {
                    Controls = {
                        new XRLabel{ExpressionBindings = {new ExpressionBinding(nameof(XRLabel.Text), "[ID] + ':' + [Price]")}},
                        // Running Report
                        new XRLabel{
                            ExpressionBindings = {
                                new ExpressionBinding(nameof(XRLabel.Text), "'SumA' + [ID] + ':' + sumRunningSum([Price])")},
                            Summary = new XRSummary{Running = SummaryRunning.Report},
                            LeftF = 100},

                        new XRLabel{
                            ExpressionBindings = {
                                new ExpressionBinding(nameof(XRLabel.Text), "'SumB' + [ID] + ':' + sumRunningSum([Price])"),
                                new ExpressionBinding(nameof(XRLabel.Visible), "[ShowRunningSum] == 1")},
                            Summary = new XRSummary{Running = SummaryRunning.Report},
                            LeftF = 200},
                    }
                }
            },
            DataSource = data
        };

        string reportText = ReportToText(rpt);
        Console.WriteLine(reportText); // <== generates the output above
        Assert.IsTrue(reportText.Contains("SumB2:20"));
        Assert.IsTrue(reportText.Contains("SumB5:50")); // <== Fails!
    }

    private static string ReportToText(XtraReport report)
    {
        using (var ms = new MemoryStream())
        {
            report.ExportToText(ms);
            ms.Position = 0;
            using (var sr = new StreamReader(ms))
            {
                return sr.ReadToEnd();
            }
        }
    }
}