Steps to reproduce:
- Create a test-blueprint of something, e.g. a foundation
- Select a group of something else, e.g. belts
- Place them into the clipboard by selecting them and pressing Ctrl+C
- Now select something else, e.g. some other foundation
- Open the blueprints overview, open the test-blueprint, and click on replace/save
Expected behaviour: Blueprint is replaced with the selection.
Actual behaviour: Blueprint is replaced with the stuff you copied earlier.