ARPointCloud.GetPoints() throwing OutOfRange exceptions

Hello,

There seems to be a problem with the ARPointCloud's Points property.
Running on a iOS 12 beta iPhone 8 with ARKit 2, the Vector3[] GetPoints() function always throws the mentioned exception when converting from float[] to vector3[].
Logging lenghts of both arrays, I get values like:
"GetPoints: pointCount 803
GetPoints: verts 200"
which clearly don't fit into each other nicely.
Here's the original code with some logging inserted:

Code (CSharp):

1.  
2. IntPtr pointsPtr = pointCloud_GetPointsPtr (m_Ptr);
3. int pointCount = Count;
4. Debug.Log("GetPoints: pointCount " + pointCount);
5. if (pointCount <= 0 || pointsPtr == IntPtr.Zero)
6. {
7.     return null;
8. }
9. else
10. {
11.     // Load the results into a managed array.
12.    float [] resultVertices = new float[pointCount];
13.    Marshal.Copy(pointsPtr, resultVertices, 0, pointCount);
14.  
15.    Vector3[] verts = new Vector3[(pointCount / 4)];
16.  
17.    Debug.Log("GetPoints: verts " + verts.Length);
18.  
19.    for (int count = 0; count < pointCount; count++)
20.    {
21.       //convert to Unity coords system
22.       verts[count / 4].x = resultVertices[count++];
23.       verts[count / 4].y = resultVertices[count++];
24.       verts[count / 4].z = -resultVertices[count++];
25.    }
26.  
27.    return verts;
28. }

The code throws in the for loop, once (count / 4) reaches (verts.Length).
I've re-built it to use verts.Length as counter instead and ignore the trailing couple of floats, but it looks like an error in the native code land somewhere:

Code (CSharp):

1.  
2. int count = 0;
3. for (int i = 0; i < verts.Length; i++)
4. {
5.     //convert to Unity coords system
6.    verts[i].x = resultVertices[count++];
7.    verts[i].y = resultVertices[count++];
8.    verts[i].z = -resultVertices[count++];
9.    count++;
10. }