iFrame Form on Mobile hanging on Submit (with redirect URL)

Your software
My Mautic version is: 4.4.4
My PHP version is: 7.4

There is an issue with submitting a form that is embedded on a page using iFrame with a redirect on submit on mobile. The form just hangs.
It works on desktop, but not on mobile.
If I change it to show message, submit on mobile works as well.

Anyone got any idea here?