TTI metric missing from Test Report

I am trying to get the TTI value for my webpage, but the webpagetest reports have TTI value & other cpu related metrics missing.
Please advise if this is related to any issue with WPT. I submitted the tested by setting up the “Capture Dev Tools Timeline” as true.

Test Report:
https://www.webpagetest.org/result/181114_0W_0379e34773ca7ba4be3f46581bfddf35/