Sequencer events with a payload of struct containing Object do not work

A structure containing Object as a parameter is misrecognized as a single Object and loses the parameter.
This behavior was brought in by CL-27785664.

1. Compile and launch the repro project in ue5.4 or 5.5
   (you can download the projects in UDN case linked in additional info URL )
2. Select the NewLevelSequence actor in outliner
3. Open the LevelSeqeunce in detail pane
4. Open Director BP
5. Set a break point on the custom event node
6. Start PIE
7. Check the argument on custom event node when the breakpoint are hit

Result

The input argument is cleared to default.