Resolved value from hash does not include value from mixin

[steventsao]

Does hash remove all properties in the prototype besides the resolved value of a promise?

For instance, the resolved promise wrapped in hash does not include the properties from ObjectPromiseProxy. I expect the value from hash to be the same as when the promise is independent.

//util
import PromiseProxyMixin from '@ember/object/promise-proxy-mixin';
import ObjectProxy from '@ember/object/proxy';

const ObjectPromiseProxy = ObjectProxy.extend(PromiseProxyMixin);

//route
model() {
  return hash({
    displayValue: ObjectPromiseProxy.create({
        promise: fetchBeyondProfessionalsSettings(store),
    })
  })
}

//component
displayValue.isFulfilled === undefined;

The example above would work if ObjectPromiseProxy is not within hash. Is this an expected behavior?

Thanks.