Why does const std::pair

When accessing the elements of a std::map via const auto& entry in a range-based for loop I get a reference to the actual data in the map. Using const std::pair<K,V>& on the other hand does not give a reference to the data in the std::map

Consider this example (compiled with gcc 7.4, -std=c++14)

#include <map>
#include <string>
#include <iostream>

int main(void)
{
    std::map<std::string, int> my_map ;
    for(const auto& entry : my_map)
        std::cout << entry.first << ' ' << entry.second << ' ' << &(entry.second) << std::endl;
    for(const std::pair<std::string, int>& entry : my_map)
        std::cout << entry.first << ' ' << entry.second << ' ' << &(entry.second) << std::endl;
    return 0;
}

Output:

foo 42 0x11a7eb0
foo 42 0x7ffec118cfc0

I am aware that the std::map value_type is std::pair<const Key, T>. But I don't really understand what is happening in the case of the second range-based loop.