New PR merged #38 doesn't recognize the request of wire-extender as of wire-extender's and throws 419 http response when embedding a component.
Specifically, the error lies in the isLivewireUpdateRequest. It returns false either by a request from inside the app, or outside the app (embedding a component into another site).
Downgraded it back to 1.0.0 and works ok. But the point of @dbpolito still stands. The trait is disabling all CSRF token checks for all requests.