Steps to reproduce:

Open the attached project
Open the Test-Graph asset
Right-click on the Speed node
Select the Convert to Constant option
Observe the Graph

Actual results: Converting a Node to a Constant leaves an orphaned wire that previously connected to the Node's input port. If a Graph is saved with such an orphaned wire, a warning will be thrown every time the graph is reopened

Expected results: No orphaned Wires are present after converting a Node to a Constant

Reproducible with versions: 6000.7.0a3, 6000.7.0b3, 7000.0.0a5

Can’t test with versions: 6000.6.4f1, 6000.7.0a2 (variable nodes have no Set in graph mode)

Tested on (OS): macOS 26.6.2

Notes:

"Allow to set value in graph" option for the Node must be enabled and connected for the issue to occur
Full warning message:
- Wire 0 cannot be restored: 8cad34f2fa465ecb421fbfc56d6cef59:PB31FloatNode(0a3c302bf7c8d1df7d2df1d103b82c70)@Result -> 8cad34f2fa465ecb421fbfc56d6cef59:762bde67ed908a406f244accfb5332b6@Value
  UnityEngine.Debug:LogWarning (object)
  Unity.GraphToolkit.Editor.GraphView:BuildUITree () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/UI/Views/GraphView/GraphView.cs:3818)
  Unity.GraphToolkit.Editor.GraphView:DoUpdate (Unity.GraphToolkit.CSO.Observation,Unity.GraphToolkit.CSO.Observation,Unity.GraphToolkit.CSO.Observation) (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/UI/Views/GraphView/GraphView.cs:3155)
  Unity.GraphToolkit.Editor.GraphView:Update () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/UI/Views/GraphView/GraphView.cs:3126)
  Unity.GraphToolkit.Editor.ModelViewUpdater:Observe () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/UI/Views/ModelViewUpdater.cs:41)
  Unity.GraphToolkit.CSO.ObserverManager:NotifyObservers (Unity.GraphToolkit.CSO.IState) (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/CommandStateObserver/ObserverManager.cs:269)
  Unity.GraphToolkit.CSO.CsoTool:Update () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/CommandStateObserver/CsoTool.cs:122)
  Unity.GraphToolkit.Editor.GraphTool:Update () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/EditorCommon/CommandStateObserver/GraphTool.cs:284)
  Unity.GraphToolkit.Editor.GraphViewEditorWindow:EditorUpdate () (at /Users/bokken/build/output/unity/unity/Modules/GraphToolkitEditor/GraphToolkitEditor/UI/Windows/GraphViewEditorWindow.cs:1163)
  UnityEditor.EditorApplication:Internal_CallUpdateFunctions () (at /Users/bokken/build/output/unity/unity/Editor/Mono/EditorApplication.cs:413)