"InvalidOperationException" is thrown when using Prefab > Replace to replace a Canvas GameObject with a Prefab that has an incompatible root Transform type

Unity: Scene Management

Open

6.7.X

6.6.X

6.5.X

6.4.X

6.3.X

6.0.X

Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. In Hierarchy create Cube GameObject
3. Drag Cube GameObject to Project window to create Cube Prefab
4. In Hierarchy create Canvas GameObject
5. Right-click on Canvas in Hierarchy window
6. Select Prefab > Replace and choose Cube
7. Observe the Console window

Actual results: “InvalidOperationException” errors are thrown in the Console window upon selecting the Cube Prefab

Expected results: No unhandled exceptions are thrown in the Console window. Incompatible Prefab Assets should be greyed out, filtered out from the Object Selector window when replacing a GameObject, preventing invalid selections entirely or throw descriptive, user-friendly warning dialog and gracefully cancel the operation instead of throwing unhandled exception

Reproducible with versions: 6000.0.76f1, 6000.3.17f1, 6000.4.11f1, 6000.5.0b12, 6000.6.0a7

Tested on (OS): Windows 11, macOS Tahoe 26.4.1

InvalidOperationException: Cannot convert the GameObject 'Canvas' with root transform of type RectTransform with a Prefab asset with root transform of type Transform. Transform types must match.
UnityEditor.PrefabUtility.ThrowIfInvalidArgumentsForConvertToPrefabInstance (UnityEngine.GameObject plainGameObject, UnityEngine.GameObject prefabAssetRoot, System.Boolean checkValidAsset, UnityEditor.InteractionMode mode) (at /Users/bokken/build/output/unity/unity/Editor/Mono/Prefabs/PrefabUtility.cs:2506)
UnityEditor.PrefabUtility.ConvertToPrefabInstances (UnityEngine.GameObject[] plainGameObjects, UnityEngine.GameObject prefabAssetRoot, UnityEditor.ConvertToPrefabInstanceSettings settings, UnityEditor.InteractionMode mode) (at /Users/bokken/build/output/unity/unity/Editor/Mono/Prefabs/PrefabUtility.cs:2552)
UnityEditor.PrefabReplaceUtility.OnObjectSelectorSelectionUpdated (UnityEngine.Object obj) (at /Users/bokken/build/output/unity/unity/Editor/Mono/Prefabs/PrefabReplaceUtility.cs:45)

"InvalidOperationException" is thrown when using Prefab > Replace to replace a Canvas GameObject with a Prefab that has an incompatible root Transform type

Unity: Scene Management

Open

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"InvalidOperationException" is thrown when using Prefab > Replace to replace a Canvas GameObject with a Prefab that has an incompatible root Transform type

Unity: Scene Management

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Have a workaround or additional info about this issue?