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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 for Label
5. Open Project window
6. Delete "New UI Animation Clip" Asset
7. Observe the Console window
Actual results: Warnings are thrown in the Console window
Expected results: No warnings are thrown, deleting the UI Animation Clip Asset should either remove the reference from the UXML automatically, or fail silently without spamming the Console
Reproducible with versions: 6000.6.0b1, 6000.6.0b7, 6000.7.0a4
Can’t test with versions: 6000.0.81f1, 6000.3.21f1, 6000.5.7f1, 6000.6.0a7 (UI Toolkit Animation not available)
Tested on (OS): macOS Tahoe 26.5.2 (M1), Ubuntu 24.04
Notes:
Assets/New UXML.uxml (line 2): warning: Invalid asset path: 'project://database/Assets/New%20UI%20Animation%20Clip.asset?fileID=3358089438549323042&guid=c4d0a86a563844d95b6309da0fdcbeb8&type=2#New UI Animation Clip'
UnityEditor.GUIView:ProcessEvent (UnityEngine.EntityId,intptr,bool&)
: Semantic - USS in 'style' attribute is invalid: Assets/New UXML.uxml (line 2): warning: Invalid asset path: 'project://database/Assets/New%20UI%20Animation%20Clip.asset?fileID=3358089438549323042&guid=c4d0a86a563844d95b6309da0fdcbeb8&type=2#New UI Animation Clip' UnityEditor.GUIView:ProcessEvent (UnityEngine.EntityId,intptr,bool&)
Missing asset reference 'project://database/Assets/New%20UI%20Animation%20Clip.asset?fileID=3358089438549323042&guid=c4d0a86a563844d95b6309da0fdcbeb8&type=2#New UI Animation Clip' in stylesheet 'inlineStyle'. The asset may have been deleted or moved.
UnityEditor.GUIView:ProcessEvent (UnityEngine.EntityId,intptr,bool&) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUIView.cs:86)
Missing asset reference 'project://database/Assets/New%20UI%20Animation%20Clip.asset?fileID=3358089438549323042&guid=c4d0a86a563844d95b6309da0fdcbeb8&type=2#New UI Animation Clip' in stylesheet 'inlineStyle'. The asset may have been deleted or moved.
UnityEngine.UIElements.Panel:TickSchedulingUpdaters ()
Unity.UIToolkit.Editor.PanelElement/RuntimePanel:TickSchedulingUpdaters () (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Controls/PanelElement/PanelElement+Panel.cs:44)
Unity.UIToolkit.Editor.PanelElement:FrameUpdate () (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Controls/PanelElement/PanelElement+Rendering.cs:169)
Unity.UIToolkit.Editor.UICanvas:ForceRuntimePanelUpdate (UnityEngine.UIElements.Panel) (at /Users/bokken/build/output/unity/unity/Modules/UIToolkitAuthoringEditor/Managed/Scene/UICanvas.cs:598)
UnityEditor.RetainedMode:UpdateSchedulers () (at /Users/bokken/build/output/unity/unity/Modules/UIElementsEditor/RetainedMode.cs:68)
Missing asset reference 'project://database/Assets/New%20UI%20Animation%20Clip.asset?fileID=3358089438549323042&guid=c4d0a86a563844d95b6309da0fdcbeb8&type=2#New UI Animation Clip' in stylesheet 'inlineStyle'. The asset may have been deleted or moved.
UnityEngine.UIElements.UIElementsRuntimeUtilityNative:UpdatePanels () (at /Users/bokken/build/output/unity/unity/Modules/UIElements/Core/Native/UIElementsUtility.bindings.cs:18)
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