The new Wall Street Journal video China's Answer to the Aging International Space Station: The Tech Behind Tiangong | WSJ shows what looks like it might be a fuel transfer connection decoupling at
04:14. It's a little scary because after they disconnect the fittings appear to bump and grind a bit, rather than cleanly separate with linear motion.
Question: Which two spacecraft are being shown disconnecting here, and what was the connection for?
"bonus points" for any information on this particular event in the footage; was it sub-optimal? Was anything damaged?