[BUG] Event timing on function event page

[DamonU2]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

On the demo-function-event page, not all events are being registered. It seems if there is an issue with timing in the script some of the listeners fail. If this error occurs: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'onIndividualLayerLoaded')
at demo-function-event.html:31:68
at app.tsx:238:13
Many of the listeners will not work.

Expected Behavior

All listeners should function properly

Steps To Reproduce

Go to https://canadian-geospatial-platform.github.io/geoview/public/demo-function-event.html
Check notifications - should have 32 (I think)
Refresh the page a few times and check notifiactions

Anything else?

No response