Document properties not syncing after creating word document

Question

I have created a software in Word that can store .docx files and then load them back into Word. The code to load them back in is as follows:

let text = Buffer.from(data.file, "hex").toString("base64");
            context.application.createDocument(text).open();            
            return context.sync();

The file opens correctly with the same formatting, text and structure. However, any 'Document Properties' or 'Document Info' boxes that would usually sync across the document no longer do.

I have seen that only rich text content controls work currently, and so this may be the cause of the problem.

If anyone has any feedback, that would be greatly appreciated.