Losing due dates when Updating sections with commons

[lthursto]

I have two identical courses.  I am building content in one course section and sharing to commons from settings, choosing update resource, then updating my second section.  That is working brilliantly except, all due dates in the second class section are gone after the update.  I had to reset two weeks worth.  Is there a better way?   I know I can copy a quiz to another section, but copy to another section is not available for links and assignments. 

any help would be appreciated.