Cross-staff beaming

Good afternoon. Thanks so much for everyone's work on Musescore 3. Looooove it!

I have a simple piece that calls for an arpeggio running from the bass clef into the treble clef. Single notes. I notated all the eighth notes in the bass cleff and the last two of six I used ctrl shft up arrow to move them to the treble cleff. The notes moved the beams didn't. So the notes are in the treble cleff, but they look like quarter notes. I tried the beam palette and that didn't add beams. The duration on the note entry menu shows that I have a quarter note on the staff. I can unbeam them after I place them in the bass cleff and send them to the treble and they keep their flag, but they won't let me beam them manually. If I unbeam notes elsewhere in the same measure, then try to re-beam them, it makes no change. They are still flags.

The problem measures are 11, 12, 13, and 15.

Thank you for your help.
Teresa