How does thread_local! work with dynamic libraries in rust?

As the title indicates I'm confused as to how shared libraries work with thread locals in rust. I have a minimal example below:

In a crate called minimal_thread_local_example:

Cargo.toml:

[package]
name = "minimal_thread_local_example"
version = "0.1.0"
edition = "2018"


[dependencies]
has_thread_local = {path ="./has_thread_local"}
libloading = "0.5"


[workspace]
members = ["shared_library","has_thread_local"]

src/main.rs:

extern crate libloading;


use libloading::{Library, Symbol};
use has_thread_local::{set_thread_local, get_thread_local};

fn main() {
    let lib = Library::new("libshared_library.so").unwrap();
    set_thread_local(10);
    unsafe {
        let func: Symbol<unsafe extern fn() -> u32> = lib.get(b"print_local").unwrap();
        func();
    };
    println!("From static executable:{}", get_thread_local());
}

In a crate called has_thread_local:

Cargo.toml:

[package]
name = "has_thread_local"
version = "0.1.0"
edition = "2018"

[lib]

[dependencies]

src/lib.rs:

use std::cell::RefCell;
use std::ops::Deref;


thread_local! {
    pub static A_THREAD_LOCAL : RefCell<u64> =  RefCell::new(0);
}

pub fn set_thread_local(val: u64) {
    A_THREAD_LOCAL.with(|refcell| { refcell.replace(val); })
}

pub fn get_thread_local() -> u64 {
    A_THREAD_LOCAL.with(|refcell| *refcell.borrow().deref())
}

In a crate called shared_library:

Cargo.toml:

[package]
name = "shared-library"
version = "0.1.0"
edition = "2018"

[lib]
crate-type = ["cdylib"]


[dependencies]
has_thread_local = {path = "../has_thread_local"}

src/lib.rs:

use has_thread_local::get_thread_local;

#[no_mangle]
unsafe extern "system" fn print_local() {
    println!("From shared library:{}",get_thread_local());
}

Here's a github link for the above.

In essence I have a static executable and a shared library, with a thread local variable declared in the static executable. I then set that variable to 10 and access it from the shared library and static executable.

This outputs:

From shared library:0
From static executable:10

I'm confused as to why this is outputted(occurs on both stable and nightly). I would have imagined that both would be 10, since the thread local is declared in a static executable and is only accessed via functions also located in that static executable. I'm looking for an explanation as to why I am observing this behavior, and how to make my thread local have the same value across the entire thread, aka have the same value in the shared library and static library.