I am building a plan from an existing Scrum board. On the Scrum board I have an Epic with issues - two complete, two in progress. In the "Confirm what's in Scope" step of building a new plan, I see the Epic, but not it's child issues. All the child issues have a Fix Version and the fix version is selected in the previous step of 'select the releases'. Why are the child issues missing? How do I bring those over to Advanced roadmap?