I am on day 3 of hardening my cucumber seedling. They were initially out today when it was overcast and then is suddenly turned sunny and I went to check on them after about 45 mins of on and off sun and realized that some of them had leaves that were turning white and drying up (browner folding on the edges), same with one of my eggplants. My squash, tomatoes, herbs and everything else look okay. There was plenty of water in the pots (I had watered them before they went outside). Will those ones survive and what caused them to do this?