Is the rot on the plant or on tiny little zucchini starts?Ours isn’t producing very muchmaybe it’s still early. Planted it pretty late so it took a long time growing the foliage to size haha Although now it’s starting the rot thing a tiny bit before we even get any
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If it's the fruits, that's not unusual when it's getting going because often the fruit flowers bloom first before the pollinating flowers get going. It should straighten out quickly enough.
If it's the plant you could have a squash vine borer. Little grub that eats the plant from the inside out. Treatable though if you can find the entrance hole for the grub.