Hi, this is a simple bug report.
Symptom: Groups containing other groups, outside an artboard, cannot be ungrouped.
Steps to reproduce:
- Draw 2 rectangles outside an artboard;
- Group them;
- Duplicate the previous group
- Select both groups and group them
- Try to ungroup the resulting group
Sorry for the convoluted language but, due to the nature of the issue, it was the better I could come up with.