Steps to reproduce:
1. Create new Unity project
2. Import provided script “AdvancedGraph.cs”
3. In the Project window, right-click -> Create -> Graph Toolkit Samples -> Advanced Test Graph -> Open the Graph
4. Press space in Canvas and create “TestNode” Node
5. Open “AdvancedGraph.cs” script
6. Change class name “TestNode” to “TestNodeNode”
7. Wait for the script to compile
8. Observe Node in Graph Canvas

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Actual results: Node name changes to “Missing Node” instead of updating Node name to “TestNodeNode” in Canvas after script changes

Expected results: Node name should update/change accordingly after script changes

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Reproducible with versions: 6000.4.0b7, 6000.5.0a6

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Tested on (OS): Ubuntu 24.04, macOS Silicon Tahoe 26.2 (M1)