Breaking down a Pristine Improvised Courier Bag gives you a Pristine Rope and a Pristine Burlap Sack.
So when you have a Damaged Rope and have found Damaged Burlap Sack then you can craft a Pristine Improvised Courier Bag and then by breaking it down you will get pristine items back however you have used damaged ones to craft the bag in the first place.
Take a Damaged Burlap Sack and combine it with a Damaged Rope and then break down the bag to get those items in Pristine state.
Probably this is a smaller part of a bigger problem with crafting.
Crafting a Plate Carrier Complete Set or Smersh Vest with Backpack attached is another instance of crafting issues however slightly different than getting back Pristine items.
I think that this minor flaw would only impact on those who try to craft Ghillies. To some of those players such flaw may become an exploit and a time saver (why search for pristine Burlap Sacks if you can create one from Damaged one easily).
Hello Rebeliant and thank you for the report.
This is a known issue and it has been scheduled for a fix.
Regards,
Geez