Map function behaviour is not as expected

[Hajjiri]

Current behaviour, it maps the props asynchronously only.
Expected behaviour, it maps the props as by default when component is constructed, and asynchronously.

I want to achieve the below using rxJs map,

withObservable((app, props$) => {
    return props$.pipe(map(props => ({
      foo: props.bar,
    })));
  }),

with frintJs map,

map(props => ({ foo: props.bar }))

However, the only way to do it now without rxJs map, is to use a combination of withDefault and map functions of frintJs.