I selected English (USA) as my language and Dhaka (Bangladesh, ASIA) as my timezone. I expected all fonts and text to be in English, but some areas are displaying Bangla (the language of the timezone), which I neither want nor need.
I’m not sure if this is a bug or an intended feature, but I just wanted to share this issue.
Looks like you have changed the time in the KDE settings under “Region & Language” (then this issue occurs).
If so, then undo this and set Dhaka under “Date & Time” → “Time Zone” tab.
Then it should work without issues: