When working with Document Panel Properties in Microsoft Word, better check out the “Look Up” field

If you have restored a site/site collection to new site/site collection and you are working with Quick Parts in Microsoft then beware of the Look Up fields. Look Up fields will not display values in your new restored site unless you delete it and create it once again. This is because the look up field internally stores the GUID of the list to which it looks up for values and when the site is restored to a new site/site collection and you look for values in document panel properties in MS Word, you find it blank.

Solution: You need to simply create new look up field(s) with the same name as previous ones and yeah you are done. !! Keep the name of the new Look Up fields same you may have referred your custom SharePoint Designer Workflow, code behind or somewhere else.