Given that you have 3 others that look great- Iād really rack your brain for what difference that one has had..
It kinda looks like potassium deficiency, as when itās low on potassium- internal temps of foliage to climb and causes protein cells to burn and degrade. Thatās what it looks like to me.
Possibly could be magnesium deficiency, but Iād bet potassium first.
Hope this helps amigo