I think the answer to that has to be that you have to take whatever context is associated with the object you're sent as canonical. Otherwise we'll always be second-guessing. The context on the object of the first object in whatever collection you resolve could also be "wrong". Yes, practically speaking, this may lead to errors in certain cases, however I think that's better than making the context overly relative.**edit I guess in this case, practically speaking, you'd follow up with the implementer of whatever platform is being used to resolve the context you initially got and ask them to fix their issue