Issues with `createOptionUsing(...)` and `Select::`

Select::make('downloads')
    ->label('Attached files')
    ->relationship('downloads', 'title')
    ->multiple()
    ->preload()
    ->searchable()
    ->columnSpanFull()
    ->createOptionForm(Download::getForm())
    ->createOptionUsing(function (array $data) {
        $data['is_public'] = false;

        $download = Download::query()
            ->create($data);

        return $download->title;
    }),

public static function getForm(): array
{
    return [
        TextInput::make('title')
            ->placeholder('Instructions for XYZ')
            ->prefixIcon('heroicon-o-document')
            ->columnSpanFull()
            ->required(),
        Textarea::make('description')
            ->placeholder('A short description about the file, e.g. what it contains, etc.')
            ->rows(3)
            ->columnSpanFull()
            ->required(),
        SpatieMediaLibraryFileUpload::make('download')
            ->label('File')
            ->disk('s3')
            ->acceptedFileTypes([
                'application/pdf',
                'image/*',

                // Video
                'video/mp4',
                'video/ogg',
                'video/webm',
            ])
            ->required()
            ->columnSpanFull(),
    ];
}