Not getting the same result from running a python script to generate a certain input string as i get when typing it myself

Question

I have the following code and I'm trying to buffer overflow it.

#include <stdio.h>
#include <string.h>

int main(int argc, char** argv){
    char buffer[10];
    strcpy(buffer, argv[1]);

    return 0;
}

When I run run AAAAAAAAAAAAAAAAAAAA on gdb I get the following output

Program received signal SIGSEGV, Segmentation fault.
0x41414141 in ?? ()

When I try to give my string of As through a file or a python script I get the following

(gdb) run < attack.txt 

Program received signal SIGSEGV, Segmentation fault.
0x08055718 in __strcpy_sse2 ()

I get the same output with the following command

(gdb) run <<< $(python -c 'print("\x41"*20)')

So what exactly is happening here?