Yii2在未提交事务中更正行为activerecord关系

将应用程序从yii 2.0.2升级到yii 2.0.35后，在未提交事务中通过连接表获取关系时出现问题

示例3具有活动记录“A B C”的表

AR“A”通过AR“B”与AR“C”有关联

这里有一个示例代码

    $dbTransaction = A::getDb()->beginTransaction();

    try {
        // record in junction table "B" not exist 
        $c = $a->getC();                // null in both versions because B record not exist
        $c->link('a', $a, ['is_set' => 1]);
        // record in juction table "B" created

        // from this moment different behavior
        $c = $a->getC();          // 2.0.2 return instance of C
                                       // 2.0.35 return null 

        $dbTransaction->commit();


        $c = $a->getC() instance of C in both versions
    } catch (Exception $e) {
        $dbTransaction->rollBack();
    }

我在变更日志或升级指南中没有发现差异。哪一种行为是正确的？ 有没有可能使yii2.0.35的行为与2.0.2相同

    $dbTransaction = A::getDb()->beginTransaction();

    try {
        // record in junction table "B" not exist 
        $c = $a->getC();                // null in both versions because B record not exist
        $c->link('a', $a, ['is_set' => 1]);
        // record in juction table "B" created

        // from this moment different behavior
        $c = $a->getC();          // 2.0.2 return instance of C
                                       // 2.0.35 return null 

        $dbTransaction->commit();


        $c = $a->getC() instance of C in both versions
    } catch (Exception $e) {
        $dbTransaction->rollBack();
    }