When browsing a roadmap if a user expands or collapses a section it's treated as a change and the draft of the change is cached until saved or reset even beyond their current session.  This is also a little strange considering similar behaviors in places like clicking a filter in a board aren't carried over in the same way.

 

As a result, two users accessing the same view of a roadmap may have two different experiences until they "reset" or discard their draft which makes it difficult to use the roadmap for it's intended purpose (connecting people back to a common set of goals/deliverables)