How to use XDocument to replace some nodes in a docx file but then resave to a stream which is uploaded to MS Graph

Question

I am struggling to work with XDocument to parse some data and change some values for docx file. I am able to download the file, I am able to parse the file, then I can replace those nodes in question but then when it comes to saving the file it always corrupts it. When I compare docText in the code below to the parsed values if I did .ToString() and compare what parse does, it adds some additional tags (xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main") which i am wondering if parse cannot be reused to go backwards back to the docx file. My code is as follows:

using (var memoryStream = await oneDrive.DriveItemDownloadAsync(SharedDriveID, filePathSourceMemo, "path"))
{
    var DraftDocumentMemoryStream = new MemoryStream();

    using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(memoryStream, true))
    {
        docText = null;

        using (StreamReader sr = new StreamReader(wordDoc.MainDocumentPart.GetStream()))
        {
            docText = sr.ReadToEnd();
        }

        try
        {

            var xDoc = XDocument.Parse(docText);

            xDoc.Save(DraftDocumentMemoryStream);
            DraftDocumentMemoryStream.Position = 0;
        }
        catch (Exception ex)
        {

        }
    }

        var UploadResponse = await oneDrive.UploadFileStreamAsync(SharedDriveID, DraftDocumentMemoryStream, filePathDestinationMemo, "replace");
}

I know my download and upload functions for MS Graph API work as I have saved streams from WordProcessingDocument directly and it always is good. Its this xml parser that seems to break things when i got to save as a stream. I also am not able to reopen those xdocument streams in WordProcessingDocument because it will then say file is corrupt.