Using Ionic 3.5.3 the toasts are not showing up if I use ?ionicMode=wp.
For ?ionicMode= ios and md they are working.
Is this normal?
It’s working on https://ionicframework.com/docs/api/components/toast/ToastController/ which is running on the recent version.
Did you try with a newly created project via ionic start blank blank to repro the problem?