Results from prebaked scenario are different from the same scenario in a blank proposal

Hi, @dabreegster

I told you about this issue on Discord, and I finally found out how to reproduce it.

1) Build A/B Street from Git.
2) Open "São Miguel Paulista" map.
3) Choose the "Full" scenario, which is the prebaked one.
4) Edit map: make some random edit and run the scenario. The visualizations show that the trips' results changed (as expected, since the map changed).
5) Create a new, blank proposal and make no edits (0 roads, 0 intersections changed) in the map and run the scenario again "Finish & resume".
6) Open the visualizations and see that the results are different from the baseline, prebaked scenario. But they should not be since the map was not edited.