I am confused as to why this is not of higher priority, doesn’t this drastically reduce the usefulness of actor blueprints? How are we meant to make modular blueprints when we can’t modify child blueprint parameters from any blueprints containing them? Other than at run time through the blueprint graph during run-time, of course.
+1 for feature request please.
My forum post requesting a workaround for the same issue: Workaround request: Modifying nested child actor variables from parent actors in editor - Blueprint - Unreal Engine Forums