Steps to repro:

1. Open attached project and 't1InitialRepro' scene;
2. Launch the scene;
3. In the Game view click on Stats button to open Stats panel;
4. Remember SetPass calls number;
5. Switch to Scene view;
6. Switch back to Game view;
7. Observe SetPass calls number.

Expected result:
Number of SetPass calls is the same as before.

Actual result:
Number of draws has doubled. See attached video.

Notes:
- Reproducible in 2017.11.0a5, 5.6.0p2, 5.5.2p1;
- Reproducible on both OSX 10.12.3 and Windows 10;
- The issue seems related to the current project / doesn't seems to happen in a new project.