AGI’s Commercial Space Operations Center Tracks Long March 5, AGI
“AGI’s Commercial Space Operations Center (ComSpOC) is actively tracking China’s Long March 5 launch, and the apparent two payloads entering orbit. This is, in part significant as press releases prior to the launch reportedly only registered one payload – the Shijian 17 experimental satellite. The characterization of the second object is still unknown, however COmSpOC has identified both objects making deliberate maneuvers. While these could be related to early orbit operations, the objects are in very unique and unusual orbits for typical operational spacecraft.”
The 5-tonne CZ-2F second stage rocket from the Shenzhou-11 launch reentered 2254UTC Nov 3 over Sudan.
— Jonathan McDowell (@planet4589) November 5, 2016

Could the unexpected object be the third stage of the booster? As I understand it, it has some maneuvering capability to deliver a satellite to a final orbit.
One is the sat that is undergoing experiments. The other is Yuanzheng-2, on a shakedown routine to get margins, test the refiring cap etc..