See video. https://youtu.be/LwS6zo08DlI
After you lay down and perform a sideways roll, everything below your torso may disappear for other players. Changing stance does not help. Note that the rolling wasn't properly displayed but the animation looked like the model was shunted sideways. For the third player (with the baseball cap) my legs disappeared after a roll as well, but his never did for me. My own legs reappeared for the guy with the black cap then.