add records with createOptionForm from inside MyCustomComponent triggers "Call to a member function isRelation() on null"

[KONEY]

Hello!

I implemented a custom component to add some functionalities like adding CC emails to user data.

On a working MyCustomComponent I have a relationship multiselect which should be able to add new items.

` public function mount()
{
$this->user=auth()->user();
$this->userClass=get_class($this->user);
$this->form->model($this->user);
$this->form->fill($this->user->only($this->only));
}

public function form(Form $form): Form
{
	return parent::form($form)
		->statePath('data')
		->schema([
			Select::make("emails_ccs")
				->label("E-Mails CC")
				->relationship("emails_ccs", "email")
				->getOptionLabelsUsing(fn(array $values):array=>$this->user->emails_ccs->pluck('email','id')->toArray())
				->multiple()
				->createOptionForm([
					TextInput::make("email")
						->required()
						->email()
					])
			]);
}`

This works correctly but when clicking the "+" button an error is triggered: "Call to a member function isRelation() on null." and I'm not sure what's the problem.

I tried this solution #293 but the add button won't work at all.

Thanks for any help!