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SpatialAnchor Demo Scene/Manager does not work, throws error

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Going to the new SpatialAnchor demo scene, navigating to "Create Anchor" on the UI, the pressing A to place it, produces the error.

ArgumentException: An item with the same key has already been added. Key: 0
System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <31c0f51ac5a24a22ba784db24f4ba023>:0)
System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) (at <31c0f51ac5a24a22ba784db24f4ba023>:0)
SpatialAnchorSession.tryEnableComponent (System.UInt64 anchorHandle, OVRPlugin+SpatialEntityComponentType type) (at Assets/Oculus/SampleFramework/Usage/SpatialAnchor/Scripts/SpatialAnchorSession.cs:122)
SpatialAnchorSession.CreateSpatialAnchor (UnityEngine.Transform T_UnityWorld_Anchor) (at Assets/Oculus/SampleFramework/Usage/SpatialAnchor/Scripts/SpatialAnchorSession.cs:185)
AnchorSpawner.PlaceAnchorAtTransform (UnityEngine.Transform transform) (at Assets/Oculus/SampleFramework/Usage/SpatialAnchor/Scripts/AnchorSpawner.cs:48)
AnchorUIManager.PlaceAnchor () (at Assets/Oculus/SampleFramework/Usage/SpatialAnchor/Scripts/AnchorUIManager.cs:236)
AnchorUIManager.Update () (at Assets/Oculus/SampleFramework/Usage/SpatialAnchor/Scripts/AnchorUIManager.cs:104)

The anchor does not get placed, as such I have no way to test them.