App Version (from "Chrome Settings > About Chrome"): 56.0.2896.0 canary, also in M54 beta, M56 dev, M53 stable
iOS Version: 10.0.1 beta 4
Device: 6S

Steps to reproduce: 
1. Click in the Omnibox
2. Force Touch on the keyboard to move the cursor back and forth.

Observed behavior: 
Cursor moves back and forth on two lines (first half of video).

Expected behavior: 
Cursor moves back and forth on one line of text (second half of video, GBoard).

Frequency: 5/5
<number of times you were able to reproduce> 

Additional comments: 
Bug does not exist in GBoard 1.2.0.5418.
I'm not sure what other keyboards implement this 3D Touch behavior.

Video link:
https://drive.google.com/a/google.com/file/d/0B3dPCXKQYa2dVUo5VlFNREJTSUE/view?usp=sharing