It got a little hot yesterday I think plants hit around 81 at one point when I was gone. Not sure if this is some heat stress and light burn or if it’s a nutrient problem. This is this only plant and only leaf with any signs of this
This is the tiniest form of heat stress I have ever seen in my whole growing career. Your leaves are pretty much perfect no dark spots no lights spots perfectly healthy. But yeah this is not going to cause you any issues at all its too slight. if it was an overfeed it would effect all leaves.