Repro steps:
1. Create 2 shadergraphs
2. In Shadergraph A, create a Vector 1 property and drag it onto the graph
3. Control select both the blackboard property and the property node on the graph, and ctrl+C to copy
4. Open Shadergraph B, click on the graph and then ctrl+V
Expected result: the resulting Vector 1 node will be a property and linked to the property pasted to the blackboard
Actual result: the resulting Vector 1 node will be converted to inline