I have a schematic that has had several parts changed on it. The footprints remain the same, but either the symbol has changed or a part value has changed. Whenever I import the new "logic" the many of the components are "un-placed". There is no reason for them to be removed as the ref des has not changed nor has the footprint.
I just imported a new logic file and 95 parts were removed.
How do I prevent this from happening?