Nested beams created
This beams 3_4.mscz is the file used for this video
To explain the video. I have a 3/4 time signature with all beams in the measure attached just because this takes the least work to fix beaming in the score. As you can see in the last measure I set the beam to middle so it will attach to the previous measure. When I set the last note in the second measure to start beaming, nothing seems to happen. When I set the third note in the second measure to middle beam, you get the nested beaming in the title, which should actually be a group of 2 followed by 2 groups of three. Setting the first note in measure 2 to middle beam restores sanity and properly groups the beams.
I tried to force a relayout, but this did not fix the issue. Saving closing and reopening the file does correct the display.
Things that make you say, "Huh?"