Steps to reproduce:
1. Download the attached user's project "XRSDKSmartCaveRenderingURP.zip"
2. Download the attached custom package "Custom.package.xr.sdk.zip" and add it to the project
3. Load the SmartCave XR plugin in XR Plugin Management
4. Open the "Display.scene" scene and enter Play Mode
5. Observe the loaded window with only 2 XR Views being rendered

Expected Results: all 4 XR Views are rendered
Actual Results: only 2 XR views are rendered, while others remain black

Reproducible on: 2021.3.40f1, 2022.3.38f1, 6000.0.11f1

Testing Environment: Windows 11
Not reproducible on: No other environment tested

Notes:
-Console Error:
IndexOutOfRangeException: Index was outside the bounds of the array.
UnityEngine.Rendering.Universal.MotionVectorsPersistentData.Update (UnityEngine.Rendering.Universal.CameraData& cameraData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@16.0.6/Runtime/MotionVectors.cs:82)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.RenderSingleCamera (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.CameraData& cameraData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@16.0.6/Runtime/UniversalRenderPipeline.cs:747)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.RenderCameraStack (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Camera baseCamera) (at ./Library/PackageCache/com.unity.render-pipelines.universal@16.0.6/Runtime/UniversalRenderPipeline.cs:968)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.Render (UnityEngine.Rendering.ScriptableRenderContext renderContext, System.Collections.Generic.List`1[T] cameras) (at ./Library/PackageCache/com.unity.render-pipelines.universal@16.0.6/Runtime/UniversalRenderPipeline.cs:415)
UnityEngine.Rendering.RenderPipeline.InternalRender (UnityEngine.Rendering.ScriptableRenderContext context, System.Collections.Generic.List`1[T] cameras) (at <e509afeff7384f24a8f0ac30527ff01c>:0)
UnityEngine.Rendering.RenderPipelineManager.DoRenderLoop_Internal (UnityEngine.Rendering.RenderPipelineAsset pipe, System.IntPtr loopPtr, UnityEngine.Object renderRequest, Unity.Collections.LowLevel.Unsafe.AtomicSafetyHandle safety) (at <e509afeff7384f24a8f0ac30527ff01c>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)
Render Pipeline error : the XR layout still contains active passes. Executing XRSystem.EndLayout() right now.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)