When Previewed, Material Nodes are not labeled as such until a new Node is added

When you preview a node in the material Editor, the node color will correctly switch to the Preview Blue, but will not show the preview tag until another node is added to the Graph.

Preview Node:
[Image Removed]

Added Node:
[Image Removed]

Also Reproduced in Dev-Main-CL-2839874 and 4.11-Preview 3

1. Open a Blank Project with No Starter Content
2. Create a New Material
3. Add a 3 Vector
4. Right Click the 3 Vector and Start Previewing
5. Add any other node to the graph

RESULTS: The Preview tag only appears after adding another node

EXPECTED: The Preview tag appears when you Start Previewing Node

Fix UE-51650

[UE-23848] Bug Status

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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