Not sure if this is a bug, or just a funny thing that can happen. I was building a new building, which had 1 wall where it stepped out by one block. This meant that there there 2 ‘frame’ columns diagonally from each other.
My workers came and started to build the frame. Unfortunately, one worker was stood where the other frame was being build, and ended up stuck at the top of the pole. Eventually, when the wall was high enough, they were able to get down again, so it wasn’t too serious.
Still, the worker could be a farmer or another crafter, causing bigger issues…
My worker came down when the walls connected to the post were high enough for them to step down, no ladder was needed (although it’s nice to know for the future).