I threw out a sweettooth male last year that had purple stamen as well as 1-2 frosty calyx's. I sprouted 4-5 Lemon Larry OG seeds last year as well, and 3 of them showed this trait. the two females did not hermi. I've theorized that the male cannabis plants do not like the same growing conditions as female, and may throw out these female flowers to preserve itself. Many fertilizers do contain hormones for larger, more multiple blooms. to myself, it makes sense this may cause confusion to the plants.
It may prove to be a rarely reported phenomenon, as opposed to being a rare trait. I do only have 4 years now of experience growing, but since I've started, my goals have been to breed more than produce "weight"