Sick squash leaf

This appeared within the last 12 hours on a vigorous, seemingly healthy compost volunteer in 6a.

Can anyone please help diagnose and troubleshoot?

Originally by u/Gardening_Socialist on Reddit: https://tinyurl.com/24kratlx
Sick squash leaf This appeared within the last 12 hours on a vigorous, seemingly healthy compost volunteer in 6a. Can anyone please help diagnose and troubleshoot? Originally by u/Gardening_Socialist on Reddit: https://tinyurl.com/24kratlx
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