Last step not functional

When I am on the last page to book an appointment, the form is not sent.

I use Worpress 6.2.2 and Picostrap as theme. It worked when I set it up, only just before the page is published the appointment registration runs to the second to last page and doesn’t do the last step.

When I look in the browser I see that no Ajax Call is called and nothing else is shown in the console.

In the javascript file public.min.js the submit method is registered on the button, but the next step is not called.

Here is the section from the JS file.

submit(e) {
if (void 0 !== e && e.stopPropagation(), !this.isActive || !this.isValidInput()) return;
this.disable();
let t = this.maybeSubmit();
null == t ? this.triggerNext() : 'object' != typeof t ? t ? this.triggerNext() : this.cancelSubmission() : t.then(this.triggerNext.bind(this), this.cancelSubmission.bind(this))
}
maybeSubmit() {
}
cancelSubmission() {
this.enable(),
this.react()
}
triggerBack() {
this.$element.trigger('mpa_booking_step_back', {
step: this.stepId
})
}
triggerNext() {
this.$element.trigger('mpa_booking_step_next', {
step: this.stepId
})
}

I have disabled all plugins to avoid interaction with another plugin?

Are there any compatibility issues with WordPress 6.2.2?

Can someone help me understand or solve the problem?