Steps to reproduce:
1. Create project Unity project using High Definition 3D Template
2. Create VFX Asset in Project window (Window > Visual Effects > Visual Effect Graph)
3. Open VFX Asset
4. In Blackboard > Properties add Uint property
5. Expand the Property and change Mode to Enum
6. Remove “Zero” and “One” Enum Values pressing “-“ in array list
7. Observe the the Console window
8. Go back to VFX Asset window
9. Try adding another Property in the Blackboard window
10. Observe the Blackboard window

Actual results: Errors are thrown “ArgumentOutOfRangeException” and unable to add any other Properties to Blackboard, Blackboard breaks
Expected results: It should not be allowed to remove Enum Values from Uint Property, there should be no errors, Blackboard window should not break

Reproducible with versions: 6000.0.59f1, 6000.2.6f1, 6000.3.0b4, 6000.4.0a1

Tested on (OS): macOS Silicon, Tahoe 26.0 (M1)

Full Error:
ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
System.Collections.Generic.List`1[T].get_Item (System.Int32 index) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
UnityEditor.VFX.UI.VFXEnumValuePopup..ctor (System.String label, System.Collections.Generic.List`1[T] values) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/Controls/VFXEnumValuePopup.cs:19)
UnityEditor.VFX.UI.UintPropertyRM.CreateField () (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Properties/NumericPropertiesRM.cs:184)
UnityEditor.VFX.UI.SimpleUIPropertyRM`2[T,U]..ctor (UnityEditor.VFX.UI.IPropertyRMProvider controller, System.Single labelWidth) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Properties/PropertyRM.cs:563)
UnityEditor.VFX.UI.NumericPropertyRM`2[T,U]..ctor (UnityEditor.VFX.UI.IPropertyRMProvider controller, System.Single labelWidth) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Properties/NumericPropertiesRM.cs:11)
UnityEditor.VFX.UI.UintPropertyRM..ctor (UnityEditor.VFX.UI.IPropertyRMProvider controller, System.Single labelWidth) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Properties/NumericPropertiesRM.cs:168)
System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.RuntimeConstructorInfo.InternalInvoke (System.Object obj, System.Object[] parameters, System.Boolean wrapExceptions) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
System.Reflection.RuntimeConstructorInfo.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
System.Reflection.RuntimeConstructorInfo.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
System.RuntimeType.CreateInstanceImpl (System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
System.Activator.CreateInstance (System.Type type, System.Object[] args) (at <5d2db19ad08a4bb2aaf46f8684d3674e>:0)
UnityEditor.VFX.UI.PropertyRM.Create (UnityEditor.VFX.UI.IPropertyRMProvider controller, System.Single labelWidth) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Properties/PropertyRM.cs:416)
UnityEditor.VFX.UI.VFXBlackboardPropertyView.SelfChange (System.Int32 change) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Blackboard/VFXBlackboardPropertyView.cs:184)
UnityEditor.VFX.UI.VFXBlackboardRow.UnityEditor.VFX.UI.IControlledElement.OnControllerChanged (UnityEditor.VFX.UI.ControllerChangedEvent& e) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Blackboard/VFXBlackboardRow.cs:60)
UnityEditor.VFX.UI.Controller.NotifyEventHandler (UnityEditor.VFX.UI.IControlledElement eventHandler, System.Int32 eventID) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Controllers/Controller.cs:73)
UnityEditor.VFX.UI.Controller.NotifyChange (System.Int32 eventID) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Controllers/Controller.cs:60)
UnityEditor.VFX.UI.VFXParameterController.ModelChanged (UnityEngine.Object obj) (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Elements/Controllers/VFXParameterController.cs:849)
UnityEditor.VFX.UI.VFXController`1[T].OnModelChanged () (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Controllers/Controller.cs:155)
UnityEditor.VFX.UI.VFXViewController.NotifyUpdate () (at ./Library/PackageCache/com.unity.visualeffectgraph@b6a371ddc80a/Editor/GraphView/Views/Controller/VFXViewController.cs:210)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions() (at /Users/bokken/build/output/unity/unity/Editor/Mono/EditorApplication.cs:392)