Windows application crashes when trying to move grace notes staff below the notes

Hi,

I added two grace notes to another note, and I tried to move the staff of the grace notes below the notes themselves.
I double clicked on the staff to select it, then I started to drag the staff down. But when the cursor reached the note region, the app crashed. Out of curiosity after restarting MuseScore I tried the exact same thing, with the same result.
Attached is some screenshots to better describe what I tried to do.

Regards