getElementsAtEventForMode - clarity required

[PaulIsaac-MakaraHealth]

Hi,

I'm attempting to have an onClick event return which arc of a Polar chart was clicked. Having tried seemingly every type of "interactionMode" I'm at a loss for why the function always returns an empty array. Firstly, it would help to know what it's supposed to return:

This page states:
https://www.chartjs.org/docs/latest/developers/api.html#getelementsateventformode-e-mode-options-usefinalposition

• "will return the elements that are found".

This page states:
https://www.chartjs.org/docs/latest/api/classes/Chart.html#getelementsateventformode

• "returns an InteractionItem"

In theory, if it were to return something at some point, which would I get? And singular or plural?

Additionally, passing the modes "x" or "y" (listed as legit modes on /docs/latest/configuration/interactions.html#modes)
result in an error: chart.umd.min.js:1 Uncaught TypeError: t[o] is not a function. If specific chart types disallow specific interactionModes, is it planned to document what's permissible?

Codepen here:
https://codepen.io/pi2023/pen/dywxEWg

I have only found working examples of this type of functionality it older versions of Chart.js - I promise I have looked.

Thanks.

[Udemology]

Perhaps this might help: https://youtu.be/5HATqPEL2Ro