New citizen showed up on a higher elevation plane, was stuck offscreen until I found him and built a ladder.
When upgrading a bed, my carpenter thoughtfully went and got an existing mean bed. However the old mean bed still exists in the placement view, preventing me from placing the new bed where the old one was. Actually I can’t place anything where the ghost of the old bed still lies.
Side note: when resources are left on top of completed buildings, the workers will gather them if a ladder is rebuilt to the roof level.