Level Editor - cannot select components of a blueprint, itself child actor of another blueprint

Create a blueprint "test3" and add two static meshes to the blueprint. cf test3.png

Create another blueprint "test4" add the "test3" to its component, add a child actor and add a static mesh to it. cf test4.png.

Drag-drop "test4" in level cf test_editor.png

Two actors are created: "test4" and "test3XXX". 

A) "Test3XXX" cannot be selected

B) The sphere under "ChildActor" can be selected from viewport and details tab, it can also be edited from details tab. However, the two cones that are under "test3" are not accessible unless reediting the test3 blueprint.

Are these two behaviour normal?

What are the 3 extra number in "test3" name for?