Question My Balls won't drop!

I have a simple project where I add a ball prefab when the user taps the screen. The project was working until I added Mars. Prefab has a rigid body and gravity is enabled. I think I must be missing a check mark somewhere. Any suggestions?

 

The balls appear on the screen suspended in mid air above the quad placement indicator. In a previous version of the project without MARS the balls would fall. Now it just adds balls without them falling above the placement indicator. I'm also having an issue with the pose tracker. Code below.

Code (CSharp):

1. using System.Collections.Generic;
2. using UnityEngine;
3. using UnityEngine.XR.ARFoundation;
4. using UnityEngine.XR.ARSubsystems;
5. using MoreMountains.NiceVibrations;
6.  
7. public class BallStackerAR : MonoBehaviour
8. {
9.     /// <summary>
10.     /// Reference to the Raycast Manager
11.     /// </summary>
12.     ARRaycastManager raycastManager;
13.     Camera arCamera;
14.  
15.     [Tooltip("The object to spawn when the screen is tapped")]
16.     public GameObject objectToSpawn;
17.  
18.     void Start()
19.     {
20.         //Initialize private variables
21.         raycastManager = GameObject.FindObjectOfType<ARRaycastManager>();
22.         arCamera = GameObject.FindObjectOfType<Camera>();
23.     }
24.  
25.     void LateUpdate()
26.     {
27.         //Figure out where the center of the screen is
28.         var viewportCenter = new Vector2(0.5f, 0.5f);
29.         var screenCenter = arCamera.ViewportToScreenPoint(viewportCenter);
30.  
31.         //Check if there is something in front of the center of the screen and update the placement indicator if needed
32.         UpdateIndicator(screenCenter);
33.  
34.         //If we tap on the screen, spawn an object
35.         if (Input.GetMouseButtonDown(0))
36.         {
37.             //Spawn the object above the floor to see it fall
38.             Vector3 objPos = transform.position + new Vector3(0,1,0);
39.             if (objectToSpawn)
40.             {
41.                 Instantiate(objectToSpawn, objPos, transform.rotation);
42.                 print(Physics.gravity);
43.                 MMVibrationManager.Haptic(HapticTypes.LightImpact);
44.             }
45.         }
46.     }
47.  
48.     /// <param name="screenPosition">A position in screen space</param>
49.     private void UpdateIndicator(Vector2 screenPosition)
50.     {
51.         var hits = new List<ARRaycastHit>();
52.         raycastManager.Raycast(screenPosition, hits, TrackableType.Planes);
53.  
54.         //If there is Attribute least one hit position
55.         if(hits.Count > 0)
56.         {
57.             //Get the pose data
58.             var placementPose = hits[0].pose;
59.             var camForward = arCamera.transform.forward;
60.             //We want the object to be flat
61.             camForward.y = 0;
62.             //Scale the vector to have the size of 1
63.             camForward = camForward.normalized;
64.             //Rotate to face in fron of the camera
65.             placementPose.rotation = Quaternion.LookRotation(camForward);
66.  
67.             //move Quad slightly to avoid z-fighting
68.             var newPosition = placementPose.position;
69.             newPosition.y += 0.001f;
70.             transform.SetPositionAndRotation(newPosition, placementPose.rotation);
71.         }
72.     }
73. }