Subgraph Enum slot Values are reset upon UI refresh

Steps to reproduce:

1. Import the provided package.
2. drag and drop the VFX in a scene.
3. Make sure in your project setting that Domain and Scene Reload are turn On.
4. Open the VFX.
5. Put the VFX editor window side by side with the Game view (Focused or Unfocused, but not Maximised)
6. Make sure the value of My Enum isn't default, so either Dirt or Grass.
7. Enter Play Mode.

Actual results: The UI of the VFX is refreshed and by doing so, the displayed Enum Slot value of Subgraphs are set to their default values.

Expected results: 

Even if UI is refreshed, the displayed value should be in sync with what the uset previously set and Saved.

Reproducible with versions: 6000.3.0a1 6000.1.0f1

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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