The code integrated for RT-4095 left in place a stopgap policy that allowed nodes to be removed implicitly from an old group when being added to a new group. This was put in place because enforcing the policy immediately would have been too disruptive for many code bases. Instead, a warning and exception stack trace were printed, but the old policy of implicit removal was implemented.

After all tests, samples, and applications have been updated to deal with the new policy, the stopgap policy should be removed.

It should be possible to do this simply by reverting rev febd8ca9117a from the runtime repo.