Create Event dropdown menu disappears after reroute node added to event wire

The Create Event dropdown context menu disappears after a reroute node is added to event wire. First the node depopulates, then after attempting to repopulate the context menu it removes itself from the node.

Regression (no) issue (does) occur in 4.12.5

1. Open Editor (any project)
2. Create new blueprint (any)
3. In blueprint event graph>Create Event
4. Drag from event pin>Bind to event (any)
5. Select dropdown menu>Select any option (including [none])
6. Double click event wire to create reroute node
   Note that Event dropdown menu has erased held data
7. Select any option in dropdown menu again

Results

Dropdown menu disappears from node

Expected

Dropdown menu does not depopulate, and if it does can be repopulated.

Fix UE-51650

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