GLIBCXX_DEBUG が捕捉できないエラーがある？

#define _GLIBCXX_DEBUG
#include <iostream>
using namespace std;
int main(void){
    string s = "abc";
    s[1] = s[3];
    return 0;
}

#include <iostream>
using namespace std;
int main(void){
    string s = "abc";
    s.at(1) = s.at(3);
    return 0;
}

terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::at: __n (which is 3) >= this->size() (which is 3)

#define _GLIBCXX_DEBUG
#include <iostream>
using namespace std;
int main(void){
    string s1 = "abc";
    s1[1] = s1[3];
    cout << s1 << endl;
    
    return 0;
}

ac