The tree, Carpinus caroliniana, is within a couple feet of Campanula Americana - I did not observe the megachile at the time the cuts were made. I've suspicion proximity to food may have played a role, if megachile campanulae were the artists, which I have observed in the yard.
there are cuts on the leaves from leafcutter bees. the observation for the bees is here: https://www.inaturalist.org/observations/178201769
Flat-tailed leafcutter bee photographed here earlier this month, forgot to post the plant itself. Volunteer silver maple seedling from an established one nearby.
Bee observation link: https://www.inaturalist.org/observations/171643845
evidence of leaf cutter bees but this observation is for the plant.
observation for the bee(s):
https://www.inaturalist.org/observations/178270022