Version tested: 2022.1.0b1 + Master

Steps to reproduce:
0) Create new HDRP template
1) Have two quality levels, one with enabled APV another with disabled
2) Switch to APV enabled quality level, go to Rendering Debugger/Probe Volumes and enable Display Probes
3) Switch to APV disabled quality level and observe the error

MissingReferenceException: The object of type 'Material' has been destroyed but you are still trying to access it.
Your script should either check if it is null or you should not destroy the object.
UnityEngine.Material.set_shaderKeywords (System.String[] value) (at <d192a3394f214287ac22629a13b34391>:0)
UnityEngine.Experimental.Rendering.ProbeReferenceVolume.DrawProbeDebug (UnityEngine.Camera camera) (at D:/GIT/Graphics/com.unity.render-pipelines.core/Runtime/Lighting/ProbeVolume/ProbeReferenceVolume.Debug.cs:217)
UnityEngine.Experimental.Rendering.ProbeReferenceVolume.RenderDebug (UnityEngine.Camera camera) (at D:/GIT/Graphics/com.unity.render-pipelines.core/Runtime/Lighting/ProbeVolume/ProbeReferenceVolume.Debug.cs:69)
UnityEngine.Rendering.HighDefinition.HDRenderPipeline.TryCull (UnityEngine.Camera camera, UnityEngine.Rendering.HighDefinition.HDCamera hdCamera, UnityEngine.Rendering.ScriptableRenderContext renderContext, UnityEngine.Rendering.HighDefinition.SkyManager skyManager, UnityEngine.Rendering.ScriptableCullingParameters cullingParams, UnityEngine.Rendering.HighDefinition.HDRenderPipelineAsset hdrp, UnityEngine.Rendering.HighDefinition.HDRenderPipeline+HDCullingResults& cullingResults) (at D:/GIT/Graphics/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs:2389)
UnityEngine.Rendering.HighDefinition.HDRenderPipeline.Render (UnityEngine.Rendering.ScriptableRenderContext renderContext, System.Collections.Generic.List`1[T] cameras) (at D:/GIT/Graphics/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs:1334)
UnityEngine.Rendering.RenderPipeline.InternalRender (UnityEngine.Rendering.ScriptableRenderContext context, System.Collections.Generic.List`1[T] cameras) (at <d192a3394f214287ac22629a13b34391>:0)
UnityEngine.Rendering.RenderPipelineManager.DoRenderLoop_Internal (UnityEngine.Rendering.RenderPipelineAsset pipe, System.IntPtr loopPtr, System.Collections.Generic.List`1[T] renderRequests, Unity.Collections.LowLevel.Unsafe.AtomicSafetyHandle safety) (at <d192a3394f214287ac22629a13b34391>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)