I've had this glitch happen multiple times now, where I put raw fish and/or jellyfish on the drying rack. If reloading the game before the drying is finished and they become jerky/dried, the meat appears to disappear, but is clearly still in place and reappears when it becomes jerky.
Playing the most recent Steam build. I'm not using any mods.
Put dead jellyfish and raw fish on drying racks. Quit to main menu and reload the save.