Interface functions called as events in Blueprints that implement the interface cannot be set to replicate

Interface functions called as events in Blueprints that implement the interface cannot be set to replicate. When the event node is clicked, the Details panel is empty.

Reproduced in 4.7.6, 4.8, and Main (//depot/UE4/Promotable-CL-2581498)

1. Open any project
2. Create a new Blueprint Interface
3. Create a new Actor Blueprint
4. Implement the interface in the new Actor BP
5. On Begin Play, call New Function 0
6. Select the event node in the BP graph

Result:
Nothing appears in the Details panel, so the event cannot be set to replicate.

Expected:
The same options available to custom events appear for interface events.

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