While a Custom Event's delegate pin is connected to anything its details are not visible in the Details panel

While a Custom Event's delegate pin is connected to anything its details are not visible in the Details panel. Tested with an empty reroute node as noted below as well as a Set Timer node.

Reproduced in 4.8.3 binary, 4.9.2 binary, and Main (CL 2742657)

1. Open any project
2. Create a new Actor Blueprint
3. Create a Custom Event
4. Drag off the output delegate pin
5. Create a reroute node
6. Click on the Custom Event node

Result:
While the delegate pin is connected to anything, even an empty reroute node, no details of the event are visible in the Details panel