PCG Graph callback fails after compiling blueprint

PCG graph callbacks in BP do not appear to get called correctly after the blueprint is compiled.

1. Create blueprint actor, add a PCG component to it, set it as any PCG graph.
2. Add the callback events "On Graph Started Generating" and "On Graph Cleaned" from the PCG component to the BP.
3. Connect print string nodes to both events to check if they fire.
4. Click the Generate and Cleanup buttons in the PCG details panel in the level, and observe that none of the strings are printing.