ide-helper: Exception: implode(): Argument #2 ($array) must be of type ?array, string given

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当在模型中使用自定义访问器时，运行 php bin/hyperf.php ide-helper:model 会报错，示例代码：

class Customer extends Model
{
    protected string|null $table = 'customers';

    public function getNameAttribute(): string
    {
        return trim(join(' ', [$this->attributes['first_name'], $this->attributes['last_name']]));
    }
}

报错内容：

➜  xxx-hyperf git:(main) ✗ hyperf ide-helper:model       
Exception: implode(): Argument #2 ($array) must be of type ?array, string given
Could not analyze class App\Model\UserAdmin\Customer.

Trace:
#0 ~/work/xxx-hyperf/vendor/friendsofhyperf/ide-helper/src/Command/ModelCommand.php(686): implode('|', 'string')
#1 ~/work/xxx-hyperf/vendor/friendsofhyperf/ide-helper/src/Command/ModelCommand.php(652): FriendsOfHyperf\IdeHelper\Command\ModelCommand->getReturnTypeFromReflection(Object(ReflectionMethod))
#2 ~/work/xxx-hyperf/vendor/friendsofhyperf/ide-helper/src/Command/ModelCommand.php(375): FriendsOfHyperf\IdeHelper\Command\ModelCommand->getReturnType(Object(ReflectionMethod))
#3 ~/work/xxx-hyperf/vendor/friendsofhyperf/ide-helper/src/Command/ModelCommand.php(178): FriendsOfHyperf\IdeHelper\Command\ModelCommand->getPropertiesFromMethods(Object(App\Model\UserAdmin\Customer))
#4 ~/work/xxx-hyperf/vendor/friendsofhyperf/ide-helper/src/Command/ModelCommand.php(72): FriendsOfHyperf\IdeHelper\Command\ModelCommand->generateDocs(Array)
#5 ~/work/xxx-hyperf/vendor/hyperf/command/src/Command.php(428): FriendsOfHyperf\IdeHelper\Command\ModelCommand->handle()
#6 [internal function]: Hyperf\Command\Command->Hyperf\Command\{closure}()
#7 {main}

看代码后发现错误原因是：