When an autosave/ cycle occurs and you are assigning Duplicants to build either a ladder, wire, pipe, or vent, a diagonal version of the requested item will be scheduled to be built from the upper right edge of the explores map to the current position of the cursor.
This will require the player to cancel the build and redo the actual request. However, if the Duplicants have already started the project, the terrain is permanently lost.
Steps to Reproduce
Build a “dragable” building during an autosave.
This issue has not been confirmed by a developer yet.