Engine Version: 4.17.1-3586342+++UE4+Release-4.17
If you collapse a group of Blueprint Nodes into a Collapsed Graph and place an asterisk * in the name, it cannot be copy-pasted. Only results in an “Invalid Graph”
Reproduce:
1 Open a blueprint (I used one inheriting from Actor)
2 Place a node (I used a simple branch)
3 Right-click on the node(s) and Select “Collapse Nodes”
4 Give the new Collapsed Graph a name containing an *
5 Select the collapsed graph and press CTRL-C
6 HIt CTRL-V
7 ???
8 Invalid Graph.