Because AnchorEntity is just a subclass of Entity that conforms to HasAnchoring which requires an AnchoringComponent I think it has always been this way as entities were always nestable.
scavengar
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Are you preparing an array of nodes within the prepare method? If yes, try adding everything to the scene (nodes and lights) first and then pass the whole Scene into the prepare method. That might help, as ARKit can then also compile the required shaders.