can not input Chinese punctuation like "：；，。、？！" in String except characters

[MetallicPickaxe]

Steps to Reproduce

1. input ""
2. try inputing Chinese punctuation like "：；，。、？！" between the "", failed
3. try inputing Chinese characters between the "", succeeded

Expected Behavior

Actual Behavior

Environment

Xamarin Workbooks

Detail	Value
Version	1.5.0
Git Branch	1.5-release
Git Hash	11f83dc
VSTS Definition	Workbooks & Inspector (Win)

System Info

Component	Value
Windows	Microsoft Windows NT 10.0.18290.0 (64-bit)
CPU Cores	8
Physical Memory	32 GB

System-Installed Software

Component	Version
Xamarin Simulator	1010300016

VisualStudio.16.Preview Components

Component	Version
Visual Studio Enterprise 2019	16.0.0-pre.1.0+28329.73
Xamarin iOS	12.3.1-28
Xamarin Android	9.1.101-6

VisualStudio.15.Preview Components

Component	Version
Visual Studio Enterprise 2017	15.9.3-pre.1.0+28307.145
Xamarin iOS	12.2.1-11
Xamarin Android	9.1.0-38

Log File