Form submissions on mobile devices do not work; forms with multi-step page breaks (partial forms) cannot proceed to the next step, and forms with a redirect on submission do not redirect. This issue is reproducible on iOS chrome and safari, but not reproducible on macOS chrome and safari.
When forms with a redirect are submitted, the entries can be seen within the WP admin. However, forms with multi-step page breaks cannot be submitted at all, so entries cannot be seen within the WP admin.