Chrome os:
Version 72.0.3626.54(Platform 11316.71.0-19.01.10) dev-channel kevin test 
Google_Input_Tools_Version:72.0.20190106.228096708

REPRO STEPS:
1.Switch to Dayi A11y keyboard.
2.Tap the keys of first line:'1','2',...

Actual result: 
It's not number but Chinese candidate is inputted.

Note:
Tried not repro for any other A11y keyboard, e.g. Pinyin, Wubi.