Porting to 2020 - questions on the Acoustic Raytracing dll

[elefantopia]

Getting crashes on large baked scene, fine on small one. Only in 2020, fine in u6 so I'd like to verify a few assumptions.
Native.Interface.AudioSceneIRReadMemory and AudioGeometryReadMeshMemory comment says that it reads a native array into an object. Does "read" mean copy? I'm wondering if I'm disposing the temp native array too early, I mean that wouldn't explain the non-crash on small scenes but I can't come up with a different explanation.

The temp native array that needs to be created to fix the lack of .unityWebRequest.handler.nativeData should be large enough. If you could check...

IntPtr _geometryMemory     = IntPtr.Zero;

	IEnumerator LoadGeometryAsync(string relativePath)
	{
		string path = Application.streamingAssetsPath+"/"+relativePath;
	#if UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX
    path = "file://" + path;
	#endif
		Debug.Log($"Loading Geometry {name} from StreamingAssets {path}",gameObject);
		float startTime = Time.realtimeSinceStartup;
		Profiler.BeginSample("MetaXRAcousticGeometry web request get");
		// Create a custom DownloadHandler with pre-allocated NativeArray<byte>
		int                   dataLength      = 2048*2048;
		NativeDownloadHandler downloadHandler = new NativeDownloadHandler(dataLength);
		var                   unityWebRequest = UnityEngine.Networking.UnityWebRequest.Get(path);
		unityWebRequest.downloadHandler = downloadHandler;
		Profiler.EndSample();
		yield return unityWebRequest.SendWebRequest();
		if(!string.IsNullOrEmpty(unityWebRequest.error)) {
			Debug.LogError($"web request: done={unityWebRequest.isDone}: {unityWebRequest.error}",gameObject);
			yield break;
		}
		float readTime     = Time.realtimeSinceStartup;
		float readDuration = readTime-startTime;
		Debug.Log($"Geometry {name}, read time = {readDuration}",gameObject);

		// Load the data from the NativeArray byte buffer
		LoadGeometryFromMemory(downloadHandler.nativeData.AsReadOnly());
	}

	async void LoadGeometryFromMemory(Unity.Collections.NativeArray<byte>.ReadOnly data)
	{
		if(data.Length==0) return;
		float startTime = Time.realtimeSinceStartup;
		int   result    = -1;
		await Task.Run(() =>
									{
										unsafe {
											IntPtr ptr = (IntPtr) Unity.Collections.LowLevel.Unsafe.NativeArrayUnsafeUtility.GetUnsafeReadOnlyPtr(data);
											lock (this) {
												if(geometryHandle!=IntPtr.Zero) {
													result = Native.Interface.AudioGeometryReadMeshMemory(geometryHandle,ptr,(UInt64) data.Length);
													GC.KeepAlive(data);
												}
											}
										}
									});
		if(result==SUCCESS) {
			float loadDuration = Time.realtimeSinceStartup-startTime;
			Debug.Log($"Sucessfully loaded Geometry {name}, load time = {loadDuration}",gameObject);
			Native.Interface.AudioGeometrySetObjectFlag(geometryHandle,ObjectFlags.ENABLED,isActiveAndEnabled);
			ApplyTransform();
			Native.Interface.AudioGeometrySetObjectFlag(geometryHandle,ObjectFlags.STATIC,gameObject.isStatic);
		#if UNITY_EDITOR
			UpdateGizmoMesh();
		#endif
			_isLoaded = true;
			if(isActiveAndEnabled) { IncrementEnabledGeometryCount(); }
		} else { Debug.Log($"Unable to read the geometry {name}",gameObject); }
	}