Ladders won't be removed after building has been finished

Summary:
Building is finished but hearthlings don’t remove ladders

Steps to reproduce:
Haven’t tried reproducing. But I designed a custom building (see screenshot + savefile)

Expected Results:
Hearthlings remove ladders after finishing a building

Actual Results:
Building is finished and hearthlings remove ladders

Attachments:

Screenshot

Savefile
Savefile.7z (3.7 MB)

Version Number and Mods in use:
No Mods
Alpha 17 (3023)

System Information:
Windows 7 64bit

A post was merged into an existing topic: Hearthlings Don’t Take Down Scaffolding