Hey!
Doesn't look like you have anything wrong with the plant.
I've seen your past weeks in the diary and everything seems to be in place.
That tear could have happened moving her while training or something and you didn't notice..
Looks like a normal leaf tear. Edges don't look burnt or yellow.. if anyting, becareful when misting your plants.
Always before lights out so the water doesn't leave burn marks from the light. Only thing I can think of that could have caused that besides a simple tear.
Hope this helped.
Good luck and happy growing!