Yes, I agree. I had many lychee plants die from similar situation of being directly in sun when they are still too small. Now I'm a little wiser (not much) so I try to keep my smaller potted plants in shade, the only plants I purchased about 3ft tall that survived was the ones in partial sun under my other larger trees. I'm 2 for 7 on purchased lychee plants that are air-layered. Probably because I don't baby it enough when they are small.