Open-XML-SDK

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Describe the bug

1. Updated a customxml part (item1.xml), then saved the word document.
2. After saving the word file, I reviewed the customxml part (item1.xml) and noted that it did update correctly.
3. Opened the word doc and noted that the data in the xml gets pulled into the word document as expected.
4. Without saving the word doc, I unpacked the doc file and reviewed document.xml file and noted that it did NOT update with the updated customxml part.
5. If I perform a Save As and examine the file again, the document.xml file is updated.

Screenshots If applicable, add screenshots to help explain your problem.

To Reproduce // Please add a self-contained, minimum viable repro of the issue. // If you require external resources, please provide a gist or GitHub repro // An Xunit style test is preferred, but a console application would work too.

Using the latest version. 3.1.0 and .Net 8

Using 
 var os = new OpenSettings
 {
     MarkupCompatibilityProcessSettings = new MarkupCompatibilityProcessSettings(
 MarkupCompatibilityProcessMode.ProcessAllParts, FileFormatVersions.Office2007)
 };

Steps to reproduce the behavior:

beginning of code:

 //Word Doc - Decode the word doc from SharePoint. 
 byte[] byteWordDoc = Convert.FromBase64String(strWordDocBase64);
 MemoryStream streamWordDoc = new MemoryStream();
 streamWordDoc.Write(byteWordDoc, 0, byteWordDoc.Length);

 //XML File
 byte[] byteXMlFile = Convert.FromBase64String(strXMLFileBase64);
 XElement xmlfile = XElement.Parse(System.Text.Encoding.UTF8.GetString(byteXMlFile));


 streamWordDoc.Seek(0, SeekOrigin.Begin);

 //Get the custom part for index1.xml
 foreach (CustomXmlPart part in wordDoc.MainDocumentPart.CustomXmlParts)
 {
     
     if (part.Uri.OriginalString.IndexOf(strWordDocNamespace) != -1)
     {
         mainXMLPart = part;
         break;
     }
 }

 using (Stream stream = mainXMLPart.GetStream(FileMode.Create, FileAccess.Write))
 {
     using (XmlWriter partXMLWriter = XmlWriter.Create(stream))
     {
         xmlfile.Save(partXMLWriter);
         

     };

 }

 streamWordDoc.Seek(0, SeekOrigin.Begin);
 wordDoc.Save();
 wordDoc.Dispose();

//Convert to base64 and return as JSON payload.
var wordDocBase64 = new { worddoc = Convert.ToBase64String(streamWordDoc2.ToArray()) };

Observed behavior See notes above.

Expected behavior The document.xml to be updated.

Desktop (please complete the following information):

• OS: Windows 11
• Office version 16
• .NET Target: 8
• DocumentFormat.OpenXml Version: 3.1.0

Additional context Add any other context about the problem here.