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Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. Install Entities package via Package Manager window
3. In Hierarchy create new Sub Scene
4. Open Preferences window and go to Entities section
5. Enable “Show Advanced Worlds”
6. Open Systems window (Window > Entities > Systems)
7. Click on “Default World” dropdown
8. Select “LoadingWorld3”
9. Observe the Console window
Actual results: “ArgumentException: WorldProxy for given world LoadingWorld3 does not exist or is null” error is thrown in the Console window
Expected results: No errors are thrown in the Console window
Reproducible with versions: 6000.5.0a6 (07a4e6f4c5c6), 6000.5.6f1, 6000.6.0b6, 6000.7.0a3
Not reproducible with versions: 6000.3.21f1, 6000.4.12f1, 6000.5.0a5 (9b63d0bc55db)
Tested on (OS): macOS Tahoe 26.5.2 (M1)
ArgumentException: WorldProxy for given world LoadingWorld3 does not exist or is null Unity.Entities.Editor.WorldProxyManager.GetWorldProxyForGivenWorld (Unity.Entities.World world) (at ./Library/PackageCache/com.unity.entities@0633f08e59db/Unity.Entities.Editor/SystemSchedule/PlayerLoop/WorldProxyManager.cs:23) Unity.Entities.Editor.SystemScheduleWindow.OnWorldSelected (Unity.Entities.World world) (at ./Library/PackageCache/com.unity.entities@0633f08e59db/Unity.Entities.Editor/SystemSchedule/SystemScheduleWindow.cs:534) Unity.Entities.Editor.DOTSEditorWindow.Update () (at ./Library/PackageCache/com.unity.entities@0633f08e59db/Unity.Entities.Editor/Common/DOTSEditorWindow.cs:225) UnityEditor.HostView.SendUpdate () (at /Users/bokken/build/output/unity/unity/Editor/Mono/HostView.cs:719) UnityEditor.EditorApplication.Internal_CallUpdateFunctions () (at /Users/bokken/build/output/unity/unity/Editor/Mono/EditorApplication.cs:413) UnityEngine.StackTraceUtility:ExtractStringFromExceptionInternal(Object, String&, String&) (at /Users/bokken/build/output/unity/unity/Runtime/Export/Scripting/StackTrace.cs:50)
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