Unity XR Interaction Toolkit: XR Simple Interactable 'Select' Event Won't Fire

I'm using Unity 2022.3.2, OpenXR Plugin 1.10.0, XR Interaction Toolkit 2.5.4.

I'm trying to use the XR Simple Interactable component's 'Select Entered' event, so that when I press the trigger on the Quest Controller, something happens.

Right now I'm just trying to see a debug message. But it seems like this functionality is broken in the XR Interaction Toolkit Starter Asset Sample Scene as well as my scene..

Whether it is in the Editor using the XR Device Simulator, or building the sample scene to my Quest 3 device, when I tap hover the ray from the controller over the buttons and then press the trigger or the X/Y buttons, nothing happens.

I saw something about needing to add a Rigidbody to the game objects and I tried that, but still nothing.

Can anyone else replicate this? Or is there something that I am missing?