Broad Mite or Heat Stress?

Hello folks!
My dark pepper plants are a bit weird..
They were striving, growing quickly until they stopped. They don't look sick whatsoever but they are looking like this, in the pics.
ChatGPT said it's heat stress, Gemini said it Broad Mite infestation.
It's indeed very hot these days where I live, last 3 weeks we have over 30 Celsius almost every day.

Can someone help me identify the problem so I can try fixing it?

Thanks and happy 2026!