Please post if you have a reliable recipe for how to do this basic debugging or a link to a reliable recipe.
PS I notice in this Trailhead the step:
Turn off Lightning Web Security
As a temporary workaround to work with breakpoints, turn off Lightning Web Security.
- From Setup enter Session in the Quick Find box, and then select Session Settings.
- Under Lightning Web Security, uncheck the box for Use Lightning Web Security for Lightning web components.
- Click Save.