Directly accessing isCancelled when declaring variables, it returns false

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Please answer the questions the best you can:

1. What version of bluebird is the issue happening on? 3.7.2
2. What platform and version? (For example Node.js 0.12 or Google Chrome 32) Chrome 130.0.6723.70
3. Did this issue happen with earlier version of bluebird? 3.x (Write description of your issue here, stack traces from errors and code that reproduces the issue are helpful)

it works right if cancel the root promise

let p = CancellablePromise.delay(1000).finally(() => {
  console.log(p.isCancelled())
});
p.cancel();
// print true

if you declare another promise instance, you must access the isCancelled state asynchronously.

let p = CancellablePromise.delay(1000);
let p1 = p.then().finally(() => {
    console.log('a:', p1.isCancelled());
    setTimeout(() => {
        console.log('b:', p1.isCancelled());
     }, 0)
})
p.cancel();

// print a: false,  b: true