UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Open file index.html from attachment coverage.zip
2. Open file script.js in Sources tab
3. Press button "Instrument coverage" (without page reloading) to record coverage and then stop it to view coverage (after few seconds).

What is the expected behavior?
Nothing should be green?
https://i.snag.gy/FNoOXZ.jpg

What went wrong?
Function marked as executed:
https://i.snag.gy/8hi13w.jpg

Did this work before? N/A 

Chrome version: 68.0.3427.0 (Official Build) canary (64-bit)  Channel: canary
OS Version: 10.0
Flash Version: