Chrome os:
Version 72.0.3626.54/11316.71.0 dev-channel scarlet test
Input tools version:
72.0.20190106.228096708 (RC08)

REPRO STEPS:
1.Switch to zhuyin keyboard
2.Check layout UI, 
3.Press shift key once ,then press shift key twice ;
4.Check layout UI again

Actual:
All the layout UI are the same, have not any change 
refers to attached screenshot

 

Deleted: zhuyin.jpeg 91.1 KB

	zhuyin.jpeg 91.1 KB View Download