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Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. In Hierarchy create Label object (Right-click > UI Toolkit > Standard Elements > Label)
3. Open Animation window (Window > Animation > Animation)
4. Select “Label” in Hierarchy window and press “Create” in Animation window to create Animation clip
5. Add Color Property via “Add Property” button
6. Undo changes
7. Redo changes
8. Press “+” button and hover mouse on the opened window
9. Observe the Console window
Actual results: “Unable to find style 'IconButton' in skin 'GameSkin' Used” and “Unable to find style 'Tag MenuItem' in skin 'GameSkin' Used” warnings are thrown in the Console window, properties are not available in window
Expected results: No warnings are thrown in the Console window, available Properties are available in the window
Reproducible with versions: 6000.6.0b1, 6000.6.0b6, 6000.7.0a4
Can’t test with versions: 6000.0.80f1, 6000.3.21f1, 6000.5.6f1, 6000.6.0a7 (UI Authoring not available)
Tested on (OS): Ubuntu 24.04, macOS Tahoe 26.5.2 (M1)
Notes:
Unable to find style 'IconButton' in skin 'GameSkin' Used UnityEngine.GUIStyle:op_Implicit (string) UnityEditorInternal.AddCurvesPopupHierarchyGUI:.ctor (UnityEditor.IMGUI.Controls.TreeViewController`1<int>,UnityEditor.EditorWindow) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopupHierarchyGUI.cs:15) UnityEditorInternal.AddCurvesPopupHierarchy:InitIfNeeded (UnityEditor.EditorWindow,UnityEngine.Rect) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopupHierarchy.cs:69) UnityEditorInternal.AddCurvesPopup:Init (UnityEngine.Rect) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopup.cs:42) UnityEditorInternal.AddCurvesPopup:ShowAtPosition (UnityEngine.Rect,UnityEditorInternal.AnimationWindowState) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopup.cs:100) UnityEditor.GUIView:ProcessEvent (UnityEngine.EntityId,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUIView.cs:86)
Unable to find style 'Tag MenuItem' in skin 'GameSkin' Used UnityEngine.GUIStyle:op_Implicit (string) UnityEditorInternal.AddCurvesPopupHierarchyGUI:.ctor (UnityEditor.IMGUI.Controls.TreeViewController`1<int>,UnityEditor.EditorWindow) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopupHierarchyGUI.cs:17) UnityEditorInternal.AddCurvesPopupHierarchy:InitIfNeeded (UnityEditor.EditorWindow,UnityEngine.Rect) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopupHierarchy.cs:69) UnityEditorInternal.AddCurvesPopup:Init (UnityEngine.Rect) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopup.cs:42) UnityEditorInternal.AddCurvesPopup:ShowAtPosition (UnityEngine.Rect,UnityEditorInternal.AnimationWindowState) (at /Users/bokken/build/output/unity/unity/Modules/AnimationWindow/Editor/AddCurvesPopup.cs:100) UnityEditor.GUIView:ProcessEvent (UnityEngine.EntityId,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUIView.cs:86)
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