Random Number Generated in Constructor Returning Different Value on Begin Play

When generating a random number using FMath::RandHelper() in the constructor of an actor, attempting to print that same number on BeginPlay returns a different value than the constructor.

However, the value printed on BeginPlay will always be the same in each editor session. For example, if it prints 1 the first time, it will continue to be 1 each time you PIE until you restart the editor.

Found in 4.10.2 binary. Reproduced in 4.9.2 and Main CL 2826455

1. Open the editor
2. Create a C++ Actor Class
3. Add this code to the header

UPROPERTY()
int32 RandomNumber;

4. Add this code to the .cpp

*Constructor*

RandomNumber = FMath::RandHelper(6);

UE_LOG(LogTemp, Warning, TEXT("Constructor Number: %d"), RandomNumber);

*Begin Play*

UE_LOG(LogTemp, Warning, TEXT("Begin Play Number: %d"), RandomNumber);

5. In the editor, open the Output Log
6. Place an instance of the actor class in the level
7. PIE

Result: Constructor will print a randomized value to the output log each time you PIE, while BeginPlay will print a different value than the Constructor, but the same value as the first time you ran PIE during that editor session.

Expected: BeginPlay would print the same number as the constructor, and a different number each time you PIE.

Fix UE-51650

[UE-23848] Bug Status

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