When a document has a list in it and the element containing it is cloned into another document, there is a key not found exception if you try to export the second document.
RadFlowDocument document = new RadFlowDocument();
if (tableDocument.Sections.First().Blocks.First() is Table workSheetTable)
{
Table clonedTable = workSheetTable.Clone(document);
var newSection = document.Sections.AddSection();
newSection.Blocks.Add(clonedTable);
}
byte[] pdfBytes = pdfProvider.Export(document);
byte[] docBytes = docxProvider.Export(document);