The text is not unclear. It says they don't work where magic is suppressed or negated. That obviously includes antimagic fields, which negate magic.
And why ignore the chart? Rules text takes precedence over charts where they contradict, but they do not contradict here. A chart is an entirely legitimate clarification of the rules.
The Devs are free to not follow those rules, but the current operation smells a lot more like a bug to me than an intentional design decision.