When docking to a ship with a meat infestation, the meat can just "overlay" over your ship as if there were no walls, doors or obstacles. Especially if it has spread into space and is moving towards your ship. It disappears when you undock your ship though, so it seems like it's just part of the wreck and not meant to cross over like that?
Also, sometimes, if you happen to dock to a ship with a huge patch of meat under where your ship is docked to the wreck, you can be stuck right outside your nav station and get mauled right after docking.