Difference in behavior when hooking a library function via LD_PRELOAD on Ubuntu and CentOS [closed]

Question

There is a hook function socketHook.c that intercepts socket() calls:

#include <stdio.h>
int socket(int domain, int type, int protocol)
{
    printf("socket() has been intercepted!\n");
    return 0;
}
gcc -c -fPIC socketHook.c
gcc -shared -o socketHook.so socketHook.o

And a simple program getpwuid.c (1) that just invokes the getpwuid() function:

#include <pwd.h>

int main()
{
    getpwuid(0);
    return 0;
}
gcc getpwuid.c -o getpwuid

getpwuid() internally makes a socket() call. On CentOS:

$ strace -e trace=socket ./getpwuid
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
socket(AF_UNIX, SOCK_STREAM, 0)         = 4

On Ubuntu:

$ strace -e trace=socket ./getpwuid
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5

When running (1), socket() is intercepted on CentOS, but not on Ubuntu.

CentOS. printf() from socketHook.c is present:

$ uname -a
Linux centos-stream 4.18.0-301.1.el8.x86_64 #1 SMP Tue Apr 13 16:24:22 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

$ LD_PRELOAD=$(pwd)/socketHook.so ./getpwuid
socket() has been intercepted!

Ubuntu(Xubuntu 20.04). printf() from socketHook.c is NOT present:

$ uname -a
Linux ibse-VirtualBox 5.8.0-50-generic #56~20.04.1-Ubuntu SMP Mon Apr 12 21:46:35 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

$ LD_PRELOAD=$(pwd)/socketHook.so ./getpwuid
$

So my question is:

1. What does it depend on? I think this is affected by the fact that socket() is not called directly from the executable, but from getpwuid(), which in turn is called, if I understand correctly, from libc.so
2. How to achieve the same behavior in CentOS as in Ubuntu? I don't want intercept indirect calls from libc