When duplicating an group of objects with the Copycat tool, the new group will not be grouped if the group contains an item from the Condo I/O/Game Objects tab.
Summary of bug here.
Steps to Reproduce
Create a group of objects containing at least 1 I/O item. (I’ve tested with volumes and the floating text sign)
Duplicate the group with the copycat tool.
Observe.
Notes / Media
I’ve noticed this occasionally happens with groups without I/O, but it happens consistently with io stuff. Alt Duping does not do this.