I don't know if this has been reported, but this should be a bug:
I had my provision house set up to build (15) orders of Hardwood planks and (10) orders of Marble. I decided to collapse the provision house to move it elsewhere while it's still building the orders. Then after i rebuilt it, my resources are gone!!! (that's a lot of stuff).
It should be that either the following, ordered in correctness:
1. The provision house continues production of orders placed before demolition after completing the reconstruction.
2. The resources are returned in full before demolition.
3. Demolition is grayed "off" when orders are in place.
4. Prompted a warning that resources are lost when demolished during production.
Cheers