HeapAllocator stores the pointer returned by HeapAlloc right after the data block and, after the recent allocator refactoring, the space for this pointer was not taken into account in the calculation of the final block size. Fixes #5830
HeapAllocator stores the pointer returned by HeapAlloc right after the data block and, after the recent allocator refactoring, the space for this pointer was not taken into account in the calculation of the final block size. Fixes #5830