C ++不能在列表迭代后使用insert追加数值

#include <iostream>
#include <list>

int main() {
    std::list<int> myList = {1, 2, 3, 4, 5};

    // 迭代列表并输出元素
    for (auto it = myList.begin(); it != myList.end(); ++it) {
        std::cout << *it << " ";
        
        // 在迭代过程中追加数值
        if (*it == 3) {
            myList.push_back(6);
        }
    }

    std::cout << std::endl;

    // 输出追加后的列表
    for (auto it = myList.begin(); it != myList.end(); ++it) {
        std::cout << *it << " ";
    }

    return 0;
}

1 2 3 4 5
1 2 3 4 5 6