[NetCode] Generating GhostComponent to Terrain causes error

To reproduce:
1. Open project attached, New Scene.
2. Open Terrain and press "Generate Code".
3. Error fails:

ArgumentException: An item with the same key has already been added. Key: UnityEditor.Experimental.TerrainAPI.PaintHeightTool
System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <437ba245d8404784b9fbab9b439ac908>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) (at <437ba245d8404784b9fbab9b439ac908>:0)
Unity.NetCode.Editor.GhostAuthoringComponentEditor.GenerateGhost (Unity.NetCode.GhostAuthoringComponent ghostInfo, System.Boolean testOnly) (at Library/PackageCache/com.unity.netcode@0.2.0-preview.5/Editor/GhostAuthoringComponentEditor.cs:453)
Unity.NetCode.Editor.GhostAuthoringComponentEditor.OnInspectorGUI () (at Library/PackageCache/com.unity.netcode@0.2.0-preview.5/Editor/GhostAuthoringComponentEditor.cs:282)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorElement.cs:529)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:197)

This is reported from:
https://github.com/Unity-Technologies/multiplayer/issues/70

Fixable by changing GhostAuthoringComponentEditor.GenerateGhost method at line 442 to:
if (compType.Type != null && !typeLookup.ContainsKey(compType.Type.FullName))