I cannot add child nodes to existing hierarchies. I have had this problem for a few days now.
Repro steps
* Go to your Smart Issue Templates.
* Select an existing hierarchy.
* Click Edit on the upper-left.
* Click Add node at the bottom of the screen.
* Choose a project and issue type from the dropdowns.
* Click the node Summary to open the edit modal.
* Click Add on the bottom-right. Then click Close to return to the Edit hierarchy page.
* Click Update Hierarchy at the bottom of the page.
Expected: I return to the "Manage Hierarchies Page". The hierarchy has been updated.
Actual: I return to a blank screen with an error notification: "There was an error invoking the function - Data was modified and cannot be read." The hierarchy has not been updated.
