taxi conflict bug

In here, CCA2761 landed and taxied to the gate next to CSC2249, whom I ordered to pushback when CCA2761 was in position on the picture above. Right after CSC2249 started pushing back, CCA2761 stopped and the game declared taxi conflict, yet the passenger thingy still managed to somehow connect to that China Airlines airplane, making it unable to be moved, and both airplanes stuck.