That's not possible now, but it's a great feature request.
I have just experienced this same thing. Group icon shows green, but the node(under that group) icon shows a blinking red box, indicating that a interface is down. There is no way of seeing this unless you expand the group, to see all the nodes in that group.
Add me to the feature request please.
...some NPM Versions later - is this still not on a roadmap to be implemented?
I still have customer requests about this parent - child alarming presentation.
And they want this for nodes and their interfaces and not as well implemented with group dependencies...
I saw you verified his answer but wanted to ask if you tried setting the group to show worst status under the advanced group settings.
Not sure if that will work naturally all my nodes are behaving tonight.