Chrome Version       : 61.0.3163.38
Platform             : 9765.21.0 - Paine


What steps will reproduce the problem?
(1) set IME to Pinyin
(2) enter "tiananmen" any input area 
(3) hit "left" arrow key, and check the cursor position

What is the expected result?
the cursor should be located after "e". 

What happens instead?
the cursor moves to the end of the previous word,"an".

Please provide any additional information below. Attach a screenshot if
possible.
The issue happens on 60.0.3112.80/9592.71.0 - link