Question XR Plugin Management - toggling VR on and off doesn't work right

I'm using Unity 2019.4 and the latest XR Plugin Management with preview XR Interaction Toolkit 0.10.

The display activates using StartXR but the XR rig stops working. The view/pose in VR gets stuck and controllers don't work. With startup initialization in the plugin manager enabled, everything works fine until I exit VR and go back into VR where the same problem occurs.

Am I missing something?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.XR.Management;
5.  
6. public class XRSwitch : MonoBehaviour
7. {
8.     public bool VRMode = false;
9.     private bool started = false;
10.  
11.     void Update ()
12.     {
13.         if (VRMode)
14.         {
15.             if (!started)
16.             {
17.                 started = true;
18.                 StartCoroutine(StartXR());
19.             }
20.         } else
21.         {
22.             if (started)
23.             {
24.                 started = false;
25.                 StopXR();
26.             }
27.         }
28.     }
29.  
30.     IEnumerator StartXR()
31.     {      
32.         Debug.Log("Initializing XR...");
33.         if (XRGeneralSettings.Instance.Manager.activeLoader == null)
34.         {
35.             yield return XRGeneralSettings.Instance.Manager.InitializeLoader();
36.         }
37.  
38.  
39.         if (XRGeneralSettings.Instance.Manager.activeLoader == null)
40.         {
41.             Debug.LogError("Initializing XR Failed. Check Editor or Player log for details.");
42.         }
43.         else
44.         {
45.             Debug.Log("Starting XR...");
46.             XRGeneralSettings.Instance.Manager.activeLoader.Start();
47.         }
48.     }
49.  
50.     void StopXR()
51.     {
52.         Debug.Log("Stopping XR...");
53.  
54.         if (XRGeneralSettings.Instance.Manager.activeLoader != null)
55.         {
56.             XRGeneralSettings.Instance.Manager.activeLoader.Stop();
57.             XRGeneralSettings.Instance.Manager.DeinitializeLoader();
58.             Debug.Log("XR stopped completely.");
59.         }
60.     }
61. }
62.