I wanted to wrangle a shinebug to transport it into another room. It never got there so i repeated the procedure and noted that the carried shinebug glitched away from the dupe carrying it. it just moved in a straight line pointing down-left as the dupe was carrying it down a ladder. it vanished into the edge of the map I think.
Put a critter drop in a room with a shinebug and one in an empty room. Set up for auto-wrangle on the shinebug room for transport into the empty room.