While playing the shipwrecked DLC as WX78 I encountered a bug. After planting a coconut on the beach while the winds were blowing strong, the sapling slid across the ground. It continued to slide across the ground even after the wind had stopped. It slid through a rock before sliding off shore and across the ocean. The only interaction I could have with it was I could examine it. Thanks for your help.
Plant a coconut sapling on the beach during a gush of high wind and the sapling will slide away forever.