Raising awareness for Struct/Enum modification bug / workaround

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Same issue slightly different repro from 5.0.1

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My repro:

  1. Make a new unreal 3rd person template project (works in 5.3 and older I tested back to 4.6)
  2. Make a struct STNewStruct and put a float variable in it, OldVariable
  3. Make a new BP based on actor NewActor
  4. Add a variable of type STNewStruct to that class
  5. Place NewActor in the default loaded editor level and make sure that level is set to load on startup (important)
  6. Save All
  7. Close and relaunch the editor
  8. Open STNewStruct and add a new variable of type Transform, NewVariable
  9. NOTE: If you did the above you will see that NewActor is now marked dirty
  10. Save All without opening NewActor
  11. Restart the editor
  12. NOTE: In the Output log you will see Loading: Property 'StructProperty Unknown structure. error
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