Item be evicted before reaching the TTL

[cubicYYY]

let c = Cache::builder()
        .time_to_live(Duration::from_secs(60 * 60 * 24)) // live, 24h
        .build(),

I set my cache like this, make it unbounded.
This cache may be shared between threads.
However, I noticed that the items inserted will disappear very soon.
Is there an ensurance that items will always live longer than this TTL? How to let it expires after the TTL?

[cubicYYY]

To be more specific:
I'm using it with actix-web.
At the beginning, it works fine:

let c = Cache::builder()
        .time_to_live(Duration::from_secs(60 * 60 * 24)) // live, 24h
        .build(),
let app = MyStruct{c};
HttpServer::new(move || {
        App::new()
            .app_data(web::Data::new(app.clone()))
//....

            }).bind(("0.0.0.0", 8888))?
    .run()
    .await;

But after I changed to:

let c = Cache::builder()
        .time_to_live(Duration::from_secs(60 * 60 * 24)) // live, 24h
        .build(),
HttpServer::new(move || {
        App::new()
            .app_data(web::Data::new(MyStruct{c})) // Now inside
//....

            }).bind(("0.0.0.0", 8888))?
    .run()
    .await;

And the problem occurs.

[cubicYYY]

Is this a problem with the smart pointers, and maybe the underlying issue is something inside the unsafe impl Send/Sync ?

[cubicYYY]

The reason:
the worker threads will create a new state for each thread. So it must be done by ways like .clone()