i have 3 from seed
1 in mostly shade, the other 2 in almost full sun.
the one in mostly shade leaves are a bit darker,
which is not unusual in my experience with most tropical fruit.
the leaves will utilize more iron and magnesium for darker leaves which photosynthesize more.
the new growth on the 2 in the sun are a bit pale and once in a while do get crispy.
they are in a raised bed, and summers here can dry that soil out quick.
i use tons of organic matter, compost and mulch.
my guess is the pale new growth is due to a lack of nitrogen mainly (i dont use much in the way of chemical ferts)
ive hit it with a small amount of iron (i need to add more) and with epsom
the epsom did darken the mature leaves, but, i wouldnt use too much (1/2 teaspoonn in a 15gal or so ??)
it could make leaf burn worse, especially if it gets a lot of sun+heat and the soil dries.