Selecting all actors and copying receives "Actor [name] is referenced by another Actor, do you really want to delete it?

Selecting all actors and copying receives "Actor [name] is referenced by another Actor, do you really want to delete it?". This seems to only happen if one of the actors is referencing another actor and the project also has sub-levels.

User Description:

Hi. I have for now 1 243 actors on multilayer scene. I select one, then I pressed ctrl+A to select all. Next I pressed ctrl+C to copy and then I've got "Actor actorname is referenced by another Actor, do you really want to delete it?"

I can paste them into some text editor after that, but why this question appear? I'm very sure that I pressed ctrl+C NOT X.

1. Open a new blank project
2. Windows > Levels
3. In the Levels window, Levels > Create New > Save
4. Back in the editor, press Ctrl-A to select all actors
5. Press Ctrl-C to copy (or Right-click > Edit > Copy)

Results: The "Actor LightSource2 is referenced by another Actor, do you really want to delete it?" message pops up on copy.

Expected: For the message to not popup on copy but only when this reference is actually being deleted.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

Delay nodes occasionally don't fire the "Completed" output in a nativized build

I am not able to find world outliner how to enable it?

Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows

When I open UE4 4.24.3 it appears that. Does anyone know how to solve?

Installer 4.10 failed with error code R-1603

What method is used to fill polygonal regions when drawing spline mesh at run time?

I've been trying to follow the demo for Unreal 4 where you create the office but my unreal blanks out and crashes every time I try after I'm a few videos in everytime. It gives me a large error list everytime

How does UMG set overlapping layouts?