Reset functionality does not work on Property in Graph Inspector and also NullReference thrown

Steps to Repro:

1. Create a new Project in URP or HDRP Template
2. Create a Shader Graph
3. Create a "Vector 1" property in Blackboard
4. Select property in Blackboard > GraphInspector > Node Settings > Rename the Reference
5. Select the Property and Right click > Reset reference

Expected Result:
Reference should be reset with the default value

Actual Result:
Reference is not getting reset and NullReference is also thrown

Reproducible on: 10.0.0-preview.27, 9.0.0-preview.55 with 2020.2.0b6, 2020.1.8f1

Environment: Windows 10 and Mac 10.15

Stack trace:

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.ShaderGraph.Drawing.BlackboardFieldView.<BuildContextualMenu>b__16_0 (UnityEngine.UIElements.DropdownMenuAction e) (at Library/PackageCache/com.unity.shadergraph@9.0.0-preview.55/Editor/Drawing/Blackboard/BlackboardFieldView.cs:119)
UnityEngine.UIElements.DropdownMenuAction.Execute () (at <e11cddb636f444f68eec62123764f018>:0)
UnityEditor.UIElements.EditorMenuExtensions+<>c__DisplayClass0_0.<PrepareMenu>b__0 () (at <7dae22651edf474ead4ab15fa947a891>:0)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[] options, System.Int32 selected) (at <7dae22651edf474ead4ab15fa947a891>:0)