Fem seed. Otherwise completely healthy. I am heavily lst'ing her but no other training yet. Her sister is ahead of her but has no strange bronze streak. I figure this is maybe another leaf repeatedly scratching it or something? It looks worse in person tbh. The picture makes it seem like a small blemish.
I have seen those before, I just assumed they were left from the tracks of some bug. Like the scarring on the rind of a cantaloupe or watermelon.
There are some predator mites, or what I and some others have concluded are predator mites, running around in the soils and some spots on the leaf. Hopefully the issue doesn't progress.