Go to the "Language" page in the "Settings".
Make sure ONLY ONE Japanese or Korean is in the language list.
Apply the settings then go back to the demo app page.
You can confirm the current language the in ActionBar title.
(P.S.: However, Chinese is ok. It is magical.)
This issue can be 100% reproduced on any Samsung phone
using OneUI 1, 2 and 3 (reffed to the Android 9, 10, and 11).
There is no such issue on pure AOSP (5 ~ 11),
or any other OEM bands StockROM like Sony, Xiaomi, etc.
Samsung A6s, Android 8.1, correct:
Samsung Note 9, Android 10 with OneUI, incorrect:
