Completely guessing that it's latent moisture from the bean itself. Again, this is something that I referenced already.
Evapotranspiration and the Water Cycle | U.S. Geological Survey
Evapotranspiration is the sum of all processes by which water moves from the land surface to the atmosphere via evaporation and transpiration.
www.usgs.gov
Given that the ground is evaporating water during the day as well as plants transpiring pretty much all the time, I would expect the humidity, and thus the dew point to be quite a bit higher as you get close to the ground. If the humidity was 90%+ within 6 inches of the ground then dew would form fairly quickly after sundown
The tell would be, if your lawn is wet is there any condensation on less porous surfaces like driveway or concrete
Edit: Should be a simple test. Take a humidity sensor (many of us have them in our safes) and place it on the lawn a half hour after sunset. After you get a reading move it to a table top or look up the RH on a weather app (the more locally fine-grained the better)
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