We encountered a bug where the companion isn't moving anymore in this puzzle:

If you also have this problem, please follow these instructions so you get rid of it and the companion follows you as it should:

• press "Esc" and choose "Reset Level"
  
• go back up to the point where you were, but draw a big stone on the pressure plate (no small stone, no root)
  
• now you should be able to continue and the companion should still be able to move around

This is not the intended solution for the puzzle and later on putting big stones on pressure plates won't be possible anymore. But luckily at the moment it is still in our game and helps you to overcome the bug. :)

You also can watch this stream (it is marked where the solution is shown) to see what is meant:
https://www.twitch.tv/videos/901101200?t=02h09m30s

Thank you for helping us finding the bugs and happy gaming!