In Office 365/SharePoint Online I created a simple document library with a few additional fields - in this case, year and month - so I could quickly duplicate a library format. A quick view of this looks like this:
In the SAME SITE, I created a new library using the template where I included the content - surprise, the some of the data was lost:
Looks like they need to tighten up a few things eh?
Solution? Use a template if you need to but remember you'll have to check all of the data!