Warning Failed to find object 'Class None.NewBlueprint' appears on any selection ChildActor Component in BlueprintEditor

Summary:

The following warning appears on each selection of any ChildActor Component inside Blueprint Editor:

LogUObjectGlobals: Warning: Failed to find object 'Class None.NewBlueprint1' (where NewBlueprint1 - is name of opened Blueprint)

More info:

• Can be reproduced in Compiled, in Saved and in Reopened blueprints and in blueprints which instances are placed on level
• Looks like can be reproduced not for all components (maybe only for childActors)
  Try Static Meshes, Skeletal Meshes, Scene, Arrow. Only ChildActor gives such warnings
• Can not be reproduced outside of Blueprint Editor:
  If I place instance of blueprint with ChildActor in level and switch selected component -> no warnings. However if I open the same blueprint in Blueprint Editor and change selected component -> warning appears
• Can be reproduced not only in Blueprints with Actor parent (as the nearest parent)
  For example such warning also appear in BP based on Character
• Similar warnings also appears with some other actions in Blueprint (for example, compilation or first creation child Actor component in blueprint)

Repro Rate: 15/15

• try to repro in different situations (in compiled, saved, reopened blueprint)

Platforms:

• Can be reproduced on Linux and on Windows
• No info about other platforms

Regression: YES

Can not be reproduced in Early Access 2 from Launcher

1. Create and open Blank BP project
2. Create and open new Blueprint Actor based class
3. Add Child Actor Component
4. Review Output Log (remember last line)
5. Select DefaultSceneRoot Conponent
6. Select Created before ChildActor Component
7. Review Output Log

Actual Result:

The following warning appears:

LogUObjectGlobals: Warning: Failed to find object 'Class None.NewBlueprint'

Expected Result:

No warnings on selection ChildActor Component