2897739 - SAP Marketing - Landing Page submit does not update all contact attributes

While submitting a form in SAP Marketing, the contact is created but not all contact attributes are filled. Some fields like address details, date of birth and all custom fields are missing in the contact details.

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

SAP Marketing Cloud Edition
SAP Marketing on-premise from Release 1809

Form, Landing page, Permission, Subscription, Double Opt-In, Pre OptIn for Marketing Permission, Pre-subscribe to Newsletter, Newsletter subscribe, Newsletter subscribe Formular, Landing-Pages, Einwilligung, Anmeldung, Double-Opt-in, Vorläuf. Opt-in f.Marketing-Einwilligung,  Vorläufige Anmeldung für Newsletter, Opt-in für Marketing-Einwilligung, Für Newsletter anmelden Formulaires, Pages d'arrivée, Consentement, Abonnement, Double Opt-in, Opt-in prélim. pr autorisation marketing, Abonnement prélim. à lettre information, Opt-in pour l'autorisation marketing, Abonnement à la lettre d'information MKT_PERM_OPTIN_PRE, NEWSL_SUBSCR_PRE, NEWSLETTER_SUBSCR, NEWSLETTER_SUBSCR , KBA , CEC-MKT-LPC , Content Studio: Landing Pages and Forms , How To