Adding objects to root crashes android

[Naremus]

I’m trying to spawn objects from C++ code using references to blueprint objects that I’ve loaded in my classes constructor, but am running into trouble with garbage collection. I’ve tried tagging the pointers with UPROPERTY() but that causes them to become corrupt somehow so I removed it and set the objects as root instead. This works perfectly when I’m testing on Windows, but causes my application to crash immediately when I deploy to my Android tablet (Samsung Galaxy Note 10.1 2014 edition).

Header File:

    //UPROPERTY(EditInstanceOnly, BlueprintReadOnly, Category = References)
	TArray<UClass*> Blueprints;

    //UPROPERTY(EditInstanceOnly, BlueprintReadOnly, Category = References)
    UClass* defectBP;

CPP File (in the constructor):

//Load Cylinder blueprint
	Blueprints.Push((UClass*)(ConstructorHelpers::FObjectFinder<UBlueprint> (TEXT("Blueprint'/Game/Blueprints/BridgeCylinder'"))).Object->GeneratedClass);
	cylinderBP = Blueprints.Last();//(UClass*)cylinderBlueprint.Object->GeneratedClass;
	cylinderBP->AddToRoot();

	//Load Cube blueprint
	Blueprints.Push((UClass*)(ConstructorHelpers::FObjectFinder<UBlueprint> (TEXT("Blueprint'/Game/Blueprints/BridgeCube'"))).Object->GeneratedClass);
	cubeBP = Blueprints.Last();//(UClass*)cubeBlueprint.Object->GeneratedClass;
	cubeBP->AddToRoot();

 	//Load I-beam blueprint
 	Blueprints.Push((UClass*)(ConstructorHelpers::FObjectFinder<UBlueprint>(TEXT("Blueprint'/Game/Blueprints/BridgeIBeam'"))).Object->GeneratedClass);
 	ibeamBP = Blueprints.Last();//(UClass*)cubeBlueprint.Object->GeneratedClass;
	ibeamBP->AddToRoot();

	defectBP = (UClass*)(ConstructorHelpers::FObjectFinder<UBlueprint>(TEXT("Blueprint'/Game/Blueprints/clicksphere'"))).Object->GeneratedClass;
	defectBP->AddToRoot();

Any suggestion as to how to load blueprints/materials without them getting garbage collected would be appreciated.

Thanks

EDIT: On further investigation, this seems to be triggered by rooting multiple blueprints, so I included a bit more of my source.

logcat output

[Naremus]

I ‘solved’ this by only rooting the first of the blueprints, and the rest seem to not get garbage collected after that, so it’s at least running without crashing. It doesn’t entirely make sense to me why the non-rooted blueprints don’t get garbage collected when the first is root and the rest are not though.

If I try adding the UPROPERTY() as you suggest, regardless of if I root them, it seems to cause the blueprints to get garbage collected sooner than without doing anything. I took some screenshots to show this in the debugger: