Crash when attempting to save Soft Object Reference

Engine will crash when attempting to save soft object reference.

"FArchive does not support FSoftObjectPtr serialization. Use FArchiveUObject instead."

Also reproduced in Main CL #4247864

Example project attached.

1. Create an Actor and SaveGame Object
2. Create a function in Child actor that adds an array of your actor soft object references.
3. In Actor: On begin play, create save game object from created class.
4. Create a SaveGameObject variable and set it to Return Value from CreateSaveGameObject
5. Call function on child actor (Feed in a reference to self as soft object reference)
6. Save game to slot with your save game object variable.

Fatal error: [Link Removed] [Line: 385] FArchive does not support FSoftObjectPtr serialization. Use FArchiveUObject instead.

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
UE4Editor_Core!FArchive::operator<<() [d:\build\++ue4\sync\engine\source\runtime\core\private\serialization\archive.cpp:386]
UE4Editor_Engine!FArchiveProxy::operator<<() [d:\build\++ue4\sync\engine\source\runtime\core\public\serialization\archiveproxy.h:58]
UE4Editor_CoreUObject!USoftObjectProperty::SerializeItem() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\propertysoftobjectptr.cpp:54]
UE4Editor_CoreUObject!UArrayProperty::SerializeItem() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\propertyarray.cpp:210]
UE4Editor_CoreUObject!FPropertyTag::SerializeTaggedProperty() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\propertytag.cpp:188]
UE4Editor_CoreUObject!UStruct::SerializeTaggedProperties() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:1167]
UE4Editor_CoreUObject!UObject::SerializeScriptProperties() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:1310]
UE4Editor_CoreUObject!UObject::Serialize() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:1244]
UE4Editor_Engine!UGameplayStatics::SaveGameToSlot() [d:\build\++ue4\sync\engine\source\runtime\engine\private\gameplaystatics.cpp:1733]
UE4Editor_Engine!UGameplayStatics::execSaveGameToSlot() [d:\build\++ue4\sync\engine\source\runtime\engine\classes\kismet\gameplaystatics.h:42]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:4728]
UE4Editor_CoreUObject!UObject::CallFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:772]
UE4Editor_CoreUObject!UObject::ProcessContextOpcode() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2197]
UE4Editor_CoreUObject!UObject::execLetBool() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2099]
UE4Editor_CoreUObject!UObject::ProcessInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:984]
UE4Editor_CoreUObject!UObject::CallFunction() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:896]
UE4Editor_CoreUObject!UObject::ProcessInternal() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:984]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\class.cpp:4728]
UE4Editor_CoreUObject!UObject::ProcessEvent() [d:\build\++ue4\sync\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1344]
UE4Editor_Engine!AActor::ProcessEvent() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:724]
UE4Editor_Engine!AActor::BeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:3250]
UE4Editor_Engine!AActor::DispatchBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\actor.cpp:3210]
UE4Editor_Engine!AWorldSettings::NotifyBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\worldsettings.cpp:230]
UE4Editor_Engine!AGameStateBase::HandleBeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\gamestatebase.cpp:177]
UE4Editor_Engine!UWorld::BeginPlay() [d:\build\++ue4\sync\engine\source\runtime\engine\private\world.cpp:3699]
UE4Editor_Engine!UGameInstance::StartPlayInEditorGameInstance() [d:\build\++ue4\sync\engine\source\runtime\engine\private\gameinstance.cpp:400]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:3298]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:2433]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:1268]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorengine.cpp:1605]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:403]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3495]
UE4Editor!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
UE4Editor!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
kernel32
ntdll