Beaming for drums in MS4

I've found a problem with the beaming for the drum kit in MS4 (running Win10). If I have a quaver (facing down, kick) and another quaver (facing up, snare) separated by a quaver rest and then I add quaver hi-hats (facing up) in between them, the beaming breaks (see attached image). All the notes are voice 1.
After some testing, I learned that it goes away if you flip any of the notes' directions and using undo doesn't restore it back to being broken.
I suspect there's already a fix for this in the works, but in case there isn't, here you go. New bug.