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Steps to reproduce:
Note: changing the node's inherited type also results in this error:
NullReferenceException: Object reference not set to an instance of an object
Unity.GraphToolkit.Editor.Implementation.GraphModelImp.OnEnable () (at ./Library/PackageCache/com.unity.graphtoolkit@516997d56518/GraphToolkitPublic/Implementation/GraphModelImp.cs:46)
Unity.GraphToolkit.Editor.GraphObject.OnEnable () (at ./Library/PackageCache/com.unity.graphtoolkit@516997d56518/GraphToolkitEditor/Model/GraphObject.cs:350)
Unity.GraphToolkit.Editor.Implementation.GraphObjectImp.OnEnable () (at ./Library/PackageCache/com.unity.graphtoolkit@516997d56518/GraphToolkitPublic/Implementation/GraphObjectImp.cs:52)
Actual results: The note stays the same despite having a different structure
Expected results: The node should be refreshed/clearly invalidated
Reproducible with versions: 0.1.0-exp.1 (6000.2.0a9), 0.4.0-exp.1 (6000.3.0b3)
Tested on (OS): Windows 11
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