Unrelated objects appears in thumbnail in editor

Development Programming & Scripting Blueprint
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2

I was able to reproduce it:

  1. Open vanilla 4.8 third person template
  2. Create 3 BP actors based on static mesh actor, name them A, B and C.
  3. Set mesh as something, for example Cube mesh
  4. In B add child actor component and set its class to C, move it on top of B
  5. In A add child actor component and set its class to B, move it on the side of A
  6. Compile, save all, add A to your level.
  7. Now look at some other BP thumbnail, like ThirdPersonCharacter. It should have cubes on it.

A,B,C Blueprints