Android build fails due to TypeLoadException when VuforiaConfiguration Resources is included in assets

Steps to Repro:
1. File > build settings > player settings
2. XR settings > enable Vuforia augmented reality supported setting
3. Observe resources folder are generated > build for Android
4. Observe console for errors

Occurring with:
2018.1.0b1

Working with:
2018.1.0a7, 2018.1.0a6

Environment:
Occurring on Windows & Mac

Stack Trace:
TypeLoadException: Could not load type 'BuildObserver' from assembly 'Vuforia.UnityExtensions.Editor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
System.MonoType.GetConstructors (BindingFlags bindingAttr) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoType.cs:134)
System.MonoType.GetConstructorImpl (BindingFlags bindingAttr, System.Reflection.Binder binder, CallingConventions callConvention, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoType.cs:95)
System.Type.GetConstructor (BindingFlags bindingAttr, System.Reflection.Binder binder, CallingConventions callConvention, System.Type[] types, System.Reflection.ParameterModifier[] modifiers) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Type.cs:1007)
System.MonoType.GetDefaultConstructor () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/MonoType.cs:75)
System.Activator.CreateInstance (System.Type type, Boolean nonPublic) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:354)
System.Activator.CreateInstance (System.Type type) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Activator.cs:254)
UnityEditor.Build.BuildPipelineInterfaces.InitializeBuildCallbacks (BuildCallbacks findFlags) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:117)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)