Validation doesn't work on form created with createOptionForm

Folks, I used the createOptionForm function to enable a new record creation form in a select field. Unfortunately, on this form, the unique() validation is not working. I followed a tip from Povilas in the code below, also without success:
// Document comes from a Leandro Ferreira package for document fields in pt_BR
Document::make('cpf')  
  ->label('CPF')
  ->live()
  ->cpf('999.999.999-99')
  ->dehydrateStateUsing(fn(string $state): string => preg_replace('/[.-]+/', '', $state))
  ->unique()
  ->required()
  ->live()
  ->afterStateUpdated(function (Forms\Contracts\HasForms $livewire, Document $component) {
      $livewire->validateOnly($component->getStatePath());
  }),

It only validates required and not unique. When submitting the form, the key violation error occurs, as I tested an already registered document number.

Can anyone tell me where I'm going wrong?
Solution
I implemented something similar, but without using any third party packages (Document) and the validation works as expected. Here's an example of a dropdown with the option to create a new user. The unique validation is added to the email field

Forms\Components\Select::make('owner_id')
    ->relationship('owner', 'name')
    ->native(false)
    ->createOptionForm([
        Forms\Components\TextInput::make('name')
            ->required(),
        Forms\Components\TextInput::make('email')
            ->email()
            ->required()
            ->unique()
            ->live()
            ->afterStateUpdated(function (Forms\Contracts\HasForms $livewire, TextInput $component) {
                $livewire->validateOnly($component->getStatePath());
            })
    ])


Is it possible this is an issue with the Document field itself?
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