Sometimes the gripper and the object cannot detach once they are in contact
Sometimes, once the gripper and the object are in contact, they cannot detach. See the attached video. The gripper is rotated about the right finger. In theory, the object should stay static since the right finger which supports the object is unmoved. However, in the video the object and the left finger do not detach. I have set the friction coefficient of the gripper zero. What may be the reason of the problem?
I also encountered a similar problem.