Sunburned Chestnut Tree sapling??

Anyone have experience with young chestnut trees? We ordered one after doing some temperate climate research just as a trial. It arrived in beautiful condition and has been re-potted. We had it out on the back porch and since we have a lot of cloud cover, perhaps its exposure to UV rays was minimal. One day the clouds parted for a few hours and I was surprised to see the leaves looked scorched . We have new buds coming in but my concern is...does Chestnut tree want partial shade or is it sensitive to shifts in UV exposure? Because this is how our rainy SE Alaska coastal climate is. Mild but wet. Beautiful, long, sunny days when we have them but lots of cloud cover. Should we plan to throw a shade cloth over it on clear days?

That sounds strange to me. I always plant chestnut trees in full sun and they love it. I have seen chestnut leaves look really bad after they have been grown inside and then moved outside in the same season. Its better if they can always live outside. Don't know if that is what happened with your tree though. FYI, you need two for pollination to occur.