Avocado does sunburn easily, especially while young. You may need to put up some kind of shade -- shade cloth, etc. for it.
I have to be very careful and acclimate them to the sun when I bring my potted avocados outside after spending the winter indoors. (Full shade at first, part sun and more sun, etc.) Miscalculation can result in scorched leaves. One year, I was overenthusiastic in pruning one and the exposed trunk and branches turned black -- fortunately it recovered.
I imagine it might be similar to the north American PawPaw which needs to be planted in a shady spot that will get more sun later as it grows and benefits from being surrounded with a shadecloth when first planted if in an open location. I planted mine where it was shaded by a 5 foot fence and an elderberry shrub at first -- they have outgrown the protective shadows now though.
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