Stress due to hot weather. or wind.

I hope they turned out ok ;-).

Mine did this last year and also do it this year. Interestingly, only hush beans have the tendency in my trials. They grow out of it.

Burnt, hot sun on wet leaves ?

Definitely not heat-releated stress here in southern Virginia in the spring of 2023. My row of about 40 plants was planted by seed about 7 weeks ago (early April), and about one-fourth of developed a few leaves with these exact type of tan depressions. The weather has been consistently between upper 50s at night and upper 70s during the days. I put the affected leaves under a microscope and saw no thrips, aphids, or worms. The remarkable thing is that 75% of the plants are unaffected, and 95% of the leaves are unaffected. I've pinched off all affected leaves, thinking it may be spore-driven. Only other clue I can offer is that only a continuous 8-foot section of the 20-foot row has been affected, leading me to believe it may be soil-borne in that area only. Zucchini and yellow squash were grown in that spot last year. Keeping an eye on things as the first beans are developing. We'll see what happens over the summer.