The label in Violin I, div. 1 turns to roman numeral, when div 1 is on upper staff and div 2 and 3 combined on lower staff.
As can be seen in the Violin II, everything turns normal if div 1 and 2 are combined.
I hope I am doing something wrong, and this is not a bug.
Here is the dorico file: roman numeral error.dorico (392.8 KB)