I think I would use a little Sevin dust or spray. The plants are young and so fruit won't be affected and you don't know what it is but it does appear to be insect damage. If you do use Sevin apply it near sundown so as to lessen the chance of harming bees.
Every year I have to use Sevin at least once on my tomatoes for one chewing pest or another that seem immune to BT.
Bill
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