If you set up the CP, and then copy it (via either Ctrl+C or blueprint), and the paster on a new place, if the stored BP contains specific entities, the content of CP would be gone, (but the connectors would still be placed)
The following items cause the issue:
 - Mini-loaders of all kind (from miniloader-1.15.6)
 - Resource scanner (from recursive-blueprints-1.2.6)
Maybe there are other "breaking" entities as well.