Redux DevTools aren't picking up a re-hydrated store as an immutable object

[alecmev]

session has been re-hydrated, the other two have been initialized by the app. All three have toJS({...something}) as their initial values. If I log out and then log in (resulting in session being overwritten), then it appears in the same way as status and cache (which is the desired way). Not sure what the issue is, couldn't figure out how DevTools treats immutable maps on the first glance (here's the pull which does iterables in general).