When I enter or paste a simplified Chinese character, it is displayed weirdly. It looks like a 'p' character enclosed in a rectangle. Please see the picture attached. But I copy the character and paste it in other text editors, it is displayed correctly. It happens only for simplified Chinese characters, not for traditional.
This started when I checked 'Beta: use Unicode UTF-8 for the support of world langauges' in Change system locale, Country or Region in Settings of Windows 10.