Q does not resolve callbacks until next round of setImmediate()

Q-setImmediate

var q = require('q')
  , assert = require('assert')
  , dOrigin = q.defer()
  , dDependent = q.defer() //this one gets resolved by callbacks from dOrigin
  , dDependent2 = q.defer() //this one gets resolved by linking directly to dOrigin
  ;

//Link to dOrigin by registering callbacks
dOrigin.promise.then(
  function (result) {
    dDependent.fulfill(result);
  },
  function (err) {
    dDependent.reject(err);
  }
);

//Link directly to dOrigin using resolve() method
dDependent2.resolve(dOrigin);

//Resolve dOrigin
dOrigin.resolve('DONE');
assert.ok(dOrigin.promise.isFulfilled(), 'Origin promise is fulfilled');
assert.ok(dDependent.promise.isPending(), 'Dependent promise is still pending but should be fulfilled');
assert.ok(dDependent2.promise.isFulfilled(), 'Dependent2 promise is fulfilled');

//dDependent gets resolved on the next round of setImmediate()
// NOTE: this is not true for nextTick()
var ticks = 0;
function checkFulfilled () {
  ticks += 1;
  // console.log(ticks + " tick(s)");
  if (dDependent.promise.isFulfilled()) {
    console.log("It's done! in " + ticks + " ticks");
  }
  else {
    setImmediate(checkFulfilled);
  }
};

setImmediate(checkFulfilled);