why I pause the montage, but it still move a few frames and then stop?

Development Character & Animation
, ,
1 
if (AnimInstance&&Cast<ACharacter>(Result.GetActor()))
{

	UAnimMontage* CurrentMontage = AnimInstance->GetCurrentActiveMontage();

	CurrentMontage->bEnableAutoBlendOut = false;
	AnimInstance->Montage_SetPlayRate(CurrentMontage, 0.f);
	FTimerHandle TimerHandle;
	TWeakObjectPtr<USkeletalMeshComponent> WeakMeshComp = GetMesh();
	WeakMeshComp->GetWorld()->GetTimerManager().SetTimer(
		TimerHandle,
		[WeakMeshComp,&TimerHandle]()
		{
			if (WeakMeshComp.IsValid())
			{
				if (UAnimInstance* AnimInstance = WeakMeshComp->GetAnimInstance())
				{
					if (UAnimMontage* CurrentMontage = AnimInstance->GetCurrentActiveMontage())
					{
						
				AnimInstance->Montage_SetPlayRate(CurrentMontage, 1.f);
				CurrentMontage->bEnableAutoBlendOut = true;
					}
				}
			}
			WeakMeshComp->GetWorld()->GetTimerManager().ClearTimer(TimerHandle);
		},
		0.15f,
		false
	);
}

this is the code in the character class, I want the character stop the montage 0.15s and keep the pose, but in the game, the montage doesn’t stop at this frame, it continues moving a few frames(about 3-5) and finally stop, why? are there any way to solve the problem,