ZoneGraph is failing to build automatically in the editor even when the flag for Build Zone Graph While Editing is enabled. Things tried that do not cause an automatic rebuild are:
Expected Result: The ZoneShape moves and triggers a rebuild of the ZoneGraph
Actual Result: The ZoneShape is moved, but the ZoneGraph does not rebuild. This is evident due to the ZoneGraphData object showing the ZoneShape in its original location before moving. If you build the ZoneGraph again manually, the ZoneGraphData will once again be in the position of the moved ZoneShape.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-177321 in the post.