If you open IsDataOnly 's BluePrint in the Blueprint editor, the contents of the inherited property may be different.

pattern 1

1. Start UE 4 Editor.
2. Open the attached project
3. Open Debug_Child_Child in the content browser.
4. Since it is BP of DataOnly, it opens with Open Full blueprint Editor.
5. DefaultSceneRoot (Inherit) Select the component and look at Transform -> Mobility item.
6. It can be confirmed that it is Movable.

Pattern 2

1. Start UE 4 Editor.
2. Open the attached project.
3. Open Debug_Child in the conte[Link Removed]nt browser.
4. Open Debug_Child_Child in the content browser.
5. It is BP of DataOnly but it opens in Open Full blueprint Editor.
6. DefaultSceneRoot (Inherit) Select the component and look at Transform -> Mobility item.
7. It can be confirmed that it is Static.