Adding multiple pivot tables generates error about psexcel HOT 2 CLOSED

Import-Module PSExcel

# Get the data ready
    $DemoData = 1..10 | Foreach-Object{

        $EID = Get-Random -Minimum 1 -Maximum 1000
        $Date = (Get-Date).adddays(-$EID)

        New-Object -TypeName PSObject -Property @{
            Name = "jsmith$_"
            EmployeeID = $EID
            Date = $Date
        } | Select Name, EmployeeID, Date
    }

# Path to export
    $Path = 'C:\temp\broken.xlsx'

# Start with a fresh xlsx, data only:
    $DemoData | Export-XLSX -Path $Path

# Open it in excel.  Everything works, everything looks good.  Worksheet1 is what we want.
    Invoke-Item $Path

# Add a pivot table...
    $Excel = New-Object OfficeOpenXml.ExcelPackage $Path
    $SourceWorkSheet = $Excel.Workbook.Worksheets['Worksheet1']
    $RangeCoordinates = $SourceWorkSheet.Dimension.Address

    $PivotWorkSheet = $Excel.Workbook.Worksheets.Add('PivotTable1')
    $PivotTable = $PivotWorkSheet.PivotTables.Add($PivotWorkSheet.Cells["A1"], $SourceWorkSheet.Cells[$RangeCoordinates], 'PivotTable1')
    $Excel.Save()
    $Excel.Dispose()

# Open it in excel.  Everything works, everything looks good.
# Worksheet1 and PivotTable1 are there.
    Invoke-Item $Path

# Add another pivot table...
    $Excel = New-Object OfficeOpenXml.ExcelPackage $Path
    $SourceWorkSheet = $Excel.Workbook.Worksheets['Worksheet1']
    $RangeCoordinates = $SourceWorkSheet.Dimension.Address

    $PivotWorkSheet = $Excel.Workbook.Worksheets.Add('PivotTable2')
    $PivotTable = $PivotWorkSheet.PivotTables.Add($PivotWorkSheet.Cells["A1"], $SourceWorkSheet.Cells[$RangeCoordinates], 'PivotTable2')
    $Excel.Save()
    $Excel.Dispose()

# No errors... but now open it in excel...
    Invoke-Item $Path

# Previously described issue occurs.