Does not render CustomXmlPart inserted by Chem4Word

[MikeWilliams-UK]

Using Chem4Word insert a chemical structure (Chem4Word is at https://github.com/Chem4Word/Version3-2)
Save the document and close word.
Open the document using OpenXmlFileViewer
Click on item1.xml in the tree view

The xml for the inserted chemistry is not displayed correctly in the read tab

The xml is shown correctly in the Edit tab

At this moment I am not sure if Chem4Word or OpenXmlFileViewer is at fault

[MikeWilliams-UK]

If I edit the xml then save the file with your UI it shows corectly and still works in Chem4Word.
Still not sure if we or you are at fault here

Files renamed to .zip show differences in xml data

On the left hand side is our original on the right hand side is a file after editing in your UI
Looks like the edit tab is adding the xml header during save