Native struct types that declare one or more non-UPROPERTY fields are not initialized with the default value from a modified Blueprint CDO.

Dynamically-spawned instances of a Blueprint class go through an optimized property initialization pass (see UBlueprintGeneratedClass::BuildCustomPropertyListForPostConstruction() and InitPropertiesFromCustomList()). This code path does not properly account for native struct-typed values that either (a) specify their own Identical()/Copy() functions, or (b) do not declare any UPROPERTY() fields. FDateTime is one example of (b) that we currently have in engine code, which also includes a property type customization that allows the default value to be modified. As a result, the struct value in the spawned instance will not currently receive the modified value from the Blueprint CDO.

1. Open the attached project in UE4 (note - it was created in 4.24).
2. Double-click the MyActorBP asset to open it in the Blueprint editor. Choose "Class Defaults" and note that the DateTime value is set to "0002.02.02" (i.e. it has been changed from the default value of "0001.01.01").
3. PIE, and note that '1' is displayed in the console output.
   Expected result: '2' is displayed (the modified "Day" value of the date in MyActorBP).

N/A

Fix UE-51650

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