Navigation Parent Items in Clusters

Is it possible to have a navigation parent item while using clusters? If so, is there a different way of doing so? I'm trying to make a page the navigation parent cluster and it doesn't seem to be working.

Page I want to be the parent:
use App\Filament\Clusters\ContentManagementSystem;
use Filament\Pages\Page;

class Tester extends Page
{
    protected static ?string $navigationIcon = 'heroicon-o-document-text';

    protected static ?string $cluster = ContentManagementSystem::class;

    protected static ?string $navigationGroup = 'HOMEPAGE CONTROLS';

    protected static string $view = 'filament.clusters.content-management-system.pages.controls.tester';
}


Resource I want to be the child. (The rest of the class is the
form
table and other standard functions)
class TesterResource extends Resource
{
    protected static ?string $model = Tester::class;

    protected static ?string $navigationIcon = 'heroicon-o-rectangle-stack';

    protected static ?string $navigationGroup = 'HOMEPAGE CONTROLS';

    protected static ?string $cluster = ContentManagementSystem::class;

    public static function getNavigationParentItem(): ?string
    {
        return __('filament.clusters.content-management-system.pages.homepage-controls.tester');
    }
...


I've tried just using protected static ?string $navigationParentItem = 'Tester'; but no luck there.
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