Instigator is no longer automatically set when spawning actors from blueprint

Actors that are spawned from blueprints will no longer have their instigator automatically set to the instigator that spawned them. This is a regression in 5.5, because in 5.4 and earlier a null Instigator on a SpawnActor node would be replaced by the instigator of the spawning actor. This change happened as a side effect of fixing [Link Removed] and [Link Removed] because it is now detecting the null instigator as deliberately set and overriding the automatic behavior. This same issue could be causing other values on a spawned actor to be set incorrectly set

1. Open a game in the editor (was tested with Lyra)
2. Create a new Blueprint of class Pawn named SpawnTest
3. In the SpawnTest event graph, set up the BeginPlay event to spawn a static mesh actor and then print the spawned actor's instigator, so it looks like this graph:
   [Image Removed]
4. Place an instance of this actor in a test level (such as the default Lyra map)
5. Preview the map in PIE and check the output log for the result of the print string

Expected behavior:

In 5.4 and earlier it will output "LogBlueprintUserMessages: [SpawnTest_C_1] SpawnTest_C_1" because it correctly set the instigator to SpawnTest. The exact number may differ

Broken behavior:

If this issue is not fixed it will output "LogBlueprintUserMessages: [SpawnTest_C_1] " because the instigator was not set correctly

[UE-23848] Bug Status

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