If you have some nodes in a group and drag from one of them to create a new node also in the group, the new node becomes the only member of the group.
What happens if, after adding the node, you click outside the group first, then click on the group to move it?
I have a fairly good idea what's happening; the current set of selected things has gone slightly wrong, so when you drag, the other nodes in the group are left behind.
Please raise an issue.
I think the nodes are still in the group, it is just that they the selection is mixed up. If you click away from the new node then all is well.
But if you deploy without first clicking somewhere on the desktop, they are no longer in the group
Don't have this behavior.
EDIT: like Colin, clicking anywhere restores the group
I am not seeing that. After I deploy it still looks wrong, but again, clicking away restores the situation.
I think you are right that it's just a presentation problem; the nodes are still in the group.
After deploying, dragging the node only moves the new node and the frame but eventually it picks up all the nodes in the group and resizes the frame as appropriate.
I'm not sure if just clicking somewhere always resolves it.