Bug in Derived Column for Error/Truncate Row Disposition

Given the following BIML, I would expect that a derived column get produced with the error configuration set to "IgnoreFailure" for all rows.
Instead, I see the error configuration is defaulting to "Fail Component" on the ssis design surface.

If I change the disposition to "RedirectRow" or "FailComponent" it works as expected...
If I change the disposition to "IgnoreFailure" it doesnt work

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<DerivedColumns Name="DER Ignore Casting Error">

    <DataflowOverrides>

        <OutputPath OutputPathName="Output">

            <Columns>

            <# foreach(var column in writableCols) { #>

                <Column ErrorRowDisposition="IgnoreFailure" TruncationRowDisposition="IgnoreFailure" ColumnName="<#=column.Name#>" />

            <# } #>

            </Columns>

        </OutputPath>

    </DataflowOverrides>

    <Columns>

        <# foreach(var column in writableCols) { #>

            <Column Name="<#=column.Name#>" DataType="<#=column.DataType#>" Length="<#=column.Length#>" Precision="<#=column.Precision#>" Scale="<#=column.Scale#>" CodePage="<#=column.CodePage#>">(DT_STR, 4, 1252)DUMMY_VALUE</Column>

        <# } #>

    </Columns>

</DerivedColumns>

 

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This is what I would expect to see when disposition is set to "IgnoreFailure", but I actually see  "FailComponent" on all columns.

 

 

The output biml produced for this section looks like this:

 

 

I am using BimlExpress version 1.0 with Visual Studio 2017 SSDT