Duplicant Motion Sensor does not register dupe operating rock crusher

The animation is not where the dupe stand physically. When a dupe works a building, it's on the (0,0)-tile of that building which should correspond where the animation port is. See this reddit-post for pictures: https://redd.it/d7syf4

In your case, you'd have to shift the motion sensor one tile to the left to get a green signal, but since the rock crusher is a 4x4-building, this is not possible. So you'll have to either put it one tile to the left and one tile up or rotate it and place it to side so the right tile is in range:

Also make sure this tile is lit if you want to get the Lit Workspace-buff. In your case, the ceiling light has to be one tile to the left, too.

 

or put a weight plate here and make sure the debris is always swept away:

I agree, that it can be counterintuitive sometimes and could be communicated a bit better to the player.

Edited January 4, 2021 by Rocoto
light