getNavigationBadge() wont count the model

Im probably doing something wrong but... this its not working for me.
This is my code:

protected static function getNavigationBadge(): ?string
    {
        return debug(static::getModel()::count());
    }

protected static function getNavigationBadge(): ?string
    {
        return debug(static::getModel()::count());
    }

Any idea?

getNavigationBadge() wont count the model - Filament