Engine Error for scafolding removal

Summary: Scaffolding removal did not occur until two pieces of scaffolding ladder were removed, which had been built on top of bushes next to the building. Error appeared following deletion of these ladders and scafolding removal proceeded as normal.

Expected Results:
Removal of scaffolding following construction completion of building

Actual Results:
Deletion of two floating scaffolding above bushes required to be deleted to encourage scaffolding removal

Notes:

release-687 (x64)
stonehearth/components/scaffolding/scaffolding.lua:316: attempt to index a nil value
stack traceback:
radiant/modules/common.lua:237: in function ‘report_traceback’
radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
stonehearth/components/scaffolding/scaffolding.lua:316: in function ‘get_blueprint_region’
stonehearth/components/scaffolding/scaffolding.lua:357: in function ‘set_scaffolding_region_as_destroying’
…hearth/components/scaffolding/scaffolding_region.lua:746: in function ‘_start_erasing’
…hearth/components/scaffolding/scaffolding_region.lua:376: in function ‘instance’
radiant/modules/events.lua:291: in function <radiant/modules/events.lua:285>
[C]: in function ‘xpcall’
radiant/modules/common.lua:257: in function ‘xpcall’
radiant/modules/events.lua:285: in function ‘trigger’
…earth/components/fabricator/fabricator_component.lua:255: in function ‘fn’

radiant/controllers/time_tracker_controller.lua:82: in function ‘set_now’
radiant/controllers/time_tracker_controller.lua:103: in function ‘increment_now’
radiant/modules/timer.lua:13: in function ‘instance’
radiant/modules/events.lua:291: in function <radiant/modules/events.lua:285>
[C]: in function ‘xpcall’
radiant/modules/common.lua:257: in function ‘xpcall’
radiant/modules/events.lua:285: in function ‘trigger’
radiant/modules/events.lua:398: in function ‘_trigger_gameloop’
radiant/modules/events.lua:446: in function ‘_update’
radiant/server.lua:61: in function <radiant/server.lua:58>