With AD 1.9, If you try to add a "Min Fit" constraint to a group that includes a coumpound object, it will crash:
Downloaded CompoundConstraintCrash.afdesign
Open the Constraints panel
Click on the "Min Fit" icon
💥
This can be prevented by adding the constraint to the compound object before hand, see CompoundConstraintNoCrash.afdesign.
CompoundConstraintCrash.afdesign CompoundConstraintNoCrash.afdesign