Sorry forgot to say it was the super soil recipie from TG
Looks like previous damage that has grown out, no worries. Is it just the one spot? If it was uniform over the entire plant then you'd have a problem.
I agree with Woodi at this point. Is it possible the leaves were damaged, say, when the trellis was installed? It appears to go across a few leaves in the same area. If you start seeing this in other areas, let us know. Good luck!
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