Sun scald is usually a white patch or patches that burn the cell walls of a leaf destroying
the tissue. Then the burnt white tissue just falls away in that spot.
Maybe a bit of brown along the edge of that spot. Plants recover 99% of the time unless totally fried.
Most of the early diseases look very similar. Tomato leaf mold, septoria, early blight.
Your marking sticks are out of focus but are they moldy? Sure sign of moldy soil. Pop
one plant out and check the root mass. I was potting up last night and one seedling looked fine
but the root mass was weak. Neighboring plants had well formed roots.
I wonder sometimes about those sticks. If they are pressed using a food grade starch, that could
possibly add to some mold issues.
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