Form state for fields with relationship

How can I get the submitted data for fields which have a

relationship

relationship

defined? When using

$data = $this->form->getState();

$data = $this->form->getState();

in forms

submit

submit

I only get the data of fields without relationships. I need the whole form data (in a frontend form) to "park" it in session and use it again after user has either logged in or registered.

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Form state for fields with relationship - Filament

Form state for fields with relationship

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Form state for fields with relationship

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