Hello @pdigiacobbe ...
Sorry to see that your question has been sitting out here for so long without a response. If I am reading your question correctly, you have a course assigned as your "blueprint" course, and then you have some other courses (think of these as your "child" courses) that are synced to your "blueprint" course. The "child" courses all have the course start/end dates in course "Settings" which were brought over from your SIS import. Does that sound right so far?
In your "blueprint" course, are there start/end dates listed in course "Settings"? If not, it could be that when you are syncing content from the "blueprint" courses to the "child" courses that it is wiping out those dates in each of the course "Settings" pages. We've experienced this and have had to re-enter the start/end dates that were wiped out in those "child" courses.
Not sure if this is what you are also experiencing, but just a thought I had for you. Hope it helps in some way. Take care, stay safe, and be well.
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