Testing relation manager form field visibility

livewire(InvitationsRelationManager::class, ['ownerRecord' => $model])
    ->mountTableAction(ViewAction::class, $invitation)
    ->assertFormFieldIsVisible('email')
    ->callMountedTableAction();

Failed asserting that a field with the name [email] exists on the form with the name [form] on the [App\Filament\Resources\LodgerResource\RelationManagers\InvitationsRelationManager] component.
  Failed asserting that null is an instance of class "Filament\Forms\Components\Field".

class InvitationManager extends RelationManager
{
    protected static string $relationship = 'invitations';

    protected static ?string $recordTitleAttribute = 'email';

    // ...

    public static function form(Form $form): Form
    {
        return $form
            ->schema([
                TextInput::make('email')
                    ->translateLabel()
                    ->email()
                    ->required()
                    ->dehydrateStateUsing(fn ($state) => mb_strtolower($state)),

                    // ..
            ]);
    }

    // ...
}