Permit::wait() after revoke() does not wait

Hi!
Why doesn't the "The thread is stopped" message appear in this example?

use std::thread;
use std::time::Duration;

fn main() {
    let top_permit = permit::Permit::new();
    let permit = top_permit.new_sub();
    thread::spawn(move || {
        while !permit.is_revoked() {
            thread::sleep(Duration::from_secs(1));
            println!("+");
        }
        println!("The thread is stopped");
    });

    thread::sleep(Duration::from_secs(5));    
    top_permit.revoke().wait();
}

Cargo.toml

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

[dependencies]
permit = "0.1.3"

rustc --version

rustc 1.51.0 (2fd73fabe 2021-03-23)