[BUG] Object reference not set to an instance of an object : when clicking a button in the CanvasDialog Prefab

[MaxPalmer-UH]

Pressing a button on the Canvas Dialog either directly - using a tracked hand - or indirectly - using a raycast/pointer causes an object reference not set to an instance of an object error in the console.

To reproduce

Import the packages as shown:

Steps to reproduce the behavior:

1. Create a project using Unity 2021.3.24f1
2. Set it up to use OpenXR and the hand interaction profile and meta aim extension
3. Add a number of input bindings - Microsoft Hand Interaction Profile, Oculus Touch Controller Profile, Valve Index Controller Profile
4. Enable the MRTK subsystems as shown: (note I have not added with windows speech package)
5. Delete the main camera and add a new MRTK XR Rig prefab
6. Add the Canvas Dialog prefab
7. Run
8. Press the canvas dialog buttons either directly using hands or indirectly using a ray/pointer
9. Console shows an error each time the button is selected/clicked. Button appears to respond to the click as expected (depresses, hear click sound)

Expected behavior

No error is shown.

Screenshots

See above.

Your setup (please complete the following information)

• Unity Version [e.g. 2021.3.24f1]
• MRTK Version - see screenshot - testing the 4.0.0-pre.1 packages.

Target platform (please complete the following information)

• Windows 11, Steam VR, Valve Index + Ultraleap Tracking Camera and Software.

[MaxPalmer-UH]

This was an issue with not being familair with how the dialog system is meant to work. Using the dialog pool in conjunction with the prefab works fine.