If enable iostore and run BulkData.lock twice on the same frame, the second time get pointer will be nullptr

	const int32 PixelMapWidth = 256;
	const int32 PixelMapHeight = 256;
	UTexture2D* pCreateTex2D = UTexture2D::CreateTransient(PixelMapWidth, PixelMapHeight);
	FTexture2DMipMap& mip = pCreateTex2D->PlatformData->Mips[0];
	void* data = mip.BulkData.Lock(LOCK_READ_WRITE);
	check(data != nullptr);
	mip.BulkData.Unlock();
	pCreateTex2D->UpdateResource();	data = mip.BulkData.Lock(LOCK_READ_WRITE);
	check(data != nullptr);
	mip.BulkData.Unlock();
	pCreateTex2D->UpdateResource();