Version 71.0.3578.27(platform 11151.16.0-18.10.29) dev-channel kevin test
Google_Input_Tools_Version:71.0.20181106.220249536

REPRO STEPS:
1.Add a person.
2.Focus in the Email input-box.
3.Switch to US.
4.Slide on the VK.


Actual result: 
Blue line follows, but no any suggestion appear.

Expected:
Suggestion appear.

Note:
Tried Gesture works fine, when login a email account, e.g. Gmail, 163mail.