select 'default' not working in filter action/forms

FilterAction::make()
    ->form([
        Forms\Components\Select::make('month')
            ->options([
                1 => 'January',
                2 => 'February',
                3 => 'March',
                4 => 'April',
                5 => 'May',
                ...
            ])
            ->default(now()->month)
            ->selectablePlaceholder(false),
    ]),