No error window popped up for this bug. I completely constructed a 3 level building. Two game days after completion I opened the custom builkding editor to start a new building and mistakenly clicked on the existing building. No changes were made, I just backed out. Then I noticed the hearthlings had begun scaffolding the building again. I watched it proceed thinking they would finish the scaffolding, and then finish the cycle by tearing it down. The built scaffolding on the interior and exterior of the entire building but after a game day of them leaving it up they still haven’t begun deconstruction. Here are a couple of screen caps that won’t tell you much but show a beautifully scaffolded building in all of it’s glory 
Walls up showing finished building
Foundation view of all scaffolding
