I ran into a notation issue with sixteenth note triplets in 4/4 time. If the last eighth note in a half-bar is a triplet of sixteenths, and the option for beaming a half-bar of eighth notes together is enabled, it will beam the triplet, too.
I think this is working as I would expect given how this aspect of the program works at present, but I’ll check with James, the developer who implemented these varioous rules, when he’s back in the New Year.