The default scene root of an blueprint actor is not removed after adding a static mesh component via C++ until after restarting the project

The default scene root of an blueprint actor is not removed after adding a static mesh component via C++ until after restarting the project (or reloading the blueprint asset)

Found in 4.22 CL#7053642

Reproduced in 4.21 CL#4753647, 4.24Main CL#7206954

1. Create a new code project.
2. Create an actor C++ class and create a blueprint actor from it.
3. Place the actor into the level and save everything.
4. While the project is still open, in the C++ actor declare a UStaticMeshComponent and initialize it in the constructor.
5. Compile the code.
6. Once compile is complete, select the blueprint actor in the level.

RESULT

In the Details panel, the static mesh component is added to the component hierarchy and DefaultSceneRoot is nested under it.

EXPECTED

The DefaultSceneRoot to be removed.

WORKAROUND

Reload the blueprint asset. This will remove the DefaultSceneRoot.

How does TextureRenderTarget2D get TArray<uint8> type data?

Why does the REMOVE method of map container remove elements have memory leaks?

UMG RichText not appear image when packaged

Do I need to call Destory method to remove components from Actor when Destory method to remove Actor?

What is the cause of the packaging error falling back to 'GameUserSettings' in ue5?

How to delete some elements correctly when deleting an array loop?

How does TArray loop correctly remove elements in blueprints?

In UE5.4, custom variables in the level blueprint cannot be set to default values, and the eyedropper tool is also unavailable, whereas in UE4.27, these features work normally.

What is the difference between Camera and CineCamera?

What controls of umg have mouse wheel events in UE4.27?