Hi,
I think the robot object has an error on its toggle of show content.
In the following figure, the robot is moving a box. But the box is not shown when the [show content] is checked (ref. red box in the figure). 
Contrariwise, the box is shown when the toggle is unchecked.
This is the opposite of the case of human objects.
I attached the file (showcontent_robot.fsm).
Thank you.
This is by design. The robot doesn't work the same way as other objects. It has a hierarchical inner structure of joints that control the position of items it moves.
When you Show Contents on the robot, the item draws in its location relative to the robot itself:
Since that isn't where the user wants the item to be located, the robot disables its default draw contents and draws the item based on the locations of its joints as they move:
Additionally, the robot has a "planner item" that can be enabled when creating custom motion paths instead of simple motion that can be used for the robot to calculate its joint positions using inverse kinematics based on an item's position as you move it around in the 3D view. This functionality is also enabled by the design of how the robot draws its contents itself rather than using the default draw contents of the object.
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