C# LoadLibrary issue

Question

In C#, I imported the C DLL through LoadLibrary.

In .net3.5 I used Marshal.PtrToStructure to convert the pointer back to the structure

I successfully get int map_num equal to 1

But when I run .net4.8, I get 0x00007ffb. Why is this?

public struct _map_name_usr_param_t

{

public IntPtr ver_str;

public UInt32 ver;

}

[StructLayout(LayoutKind.Sequential, Pack = 2)]

public struct _map_list_usr_param_t

{

public int map_num;

[MarshalAs(UnmanagedType.ByValArray)]

public _map_name_usr_param_t[] maps;

}