Something goes wrong in day_of_week in Chinese Language in simulator

the code is :

    function getWeek() {
        var today = Gregorian.info(Time.now(), Time.FORMAT_MEDIUM);
        var week = today.day_of_week;
        return week.toString();
    }

the result is : 

1. when I switch to English Language ,it goes well 

2. when I switch to Chinese Language, it displays as pic below

3. it displays well in real device.

PIC1

the sdk version is 8.1.1 , but I have switched to several versions , no difference. early version ,as 4.1.7, in my memory, display well 

the OS version is latest Win 11

PIC2

I also have tried this in Windows settings 

PIC3

it didn't work

anyone who can help me ?