FObjectFinder.object is null on Tick

Development Rendering
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1

I have the following code:

 APracticeProjectCharacter::APracticeProjectCharacter(const FObjectInitializer& ObjectInitializer)
    	: Super(ObjectInitializer)
    {
    	static ConstructorHelpers::FObjectFinder<UMaterialInstance> materialAsset(TEXT("Material'/Game/ThirdPerson/Materials/playerMaterial_Inst.playerMaterial_Inst'"));
    	if (materialAsset.Succeeded())
    		material = (UMaterialInstanceDynamic*)materialAsset.Object;
    }
    
    void APracticeProjectCharacter::Tick(float deltaTime)
    {
    	Super::Tick(deltaTime);
    		material->SetScalarParameterValue(TEXT("power"), maxPowerLevel / powerLevel);
    }

I am trying to load material from the assets and change some parameters. On the constructor, material is not null and if I ser paramater value there it works. but on Tick function material is null and it leads to run time error. I understand why this is happaning. material is a UMaterialInstanceDynamic pointer and when FObjectFinder.object dies, materials dies too. but why does it goes null? it is static.

I also have tried to change the contructor for the following:

static ConstructorHelpers::FObjectFinder<UMaterialInstance> materialAsset(TEXT("Material'/Game/ThirdPerson/Materials/playerMaterial_Inst.playerMaterial_Inst'"));
    	if (materialAsset.Succeeded())
    		material = UMaterialInstanceDynamic::Create(materialAsset.Object, this);

But chainging the paramater is not working. Even if I change it from the constructor.
How can I get this work?