One of our instructors has a blueprint, and in that blueprint there are no due dates. 

In the course associated with that blueprint, due dates are unlocked so the instructor added due dates to that course.

However, when they resynced the blueprint, all of the due dates were gone.

So are due dates synced with the blueprint and the course associated with that blueprint? So if there are no due dates to that blueprint, does it wipe out all of the due dates on the courses associated with that blueprint? Or does canvas know that that course made changes and not get rid of those due dates?

And if they did not get rid of those due dates, i'll suspect its probably another unrelated issue.