Clay buildings repetitively posting scaffolding bugs or not completing builds

release-687 (x64)
…hearth/components/scaffolding/scaffolding_region.lua:785: attempt to index field ‘_owning_scaffolding’ (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>
…hearth/components/scaffolding/scaffolding_region.lua:785: 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 <radiant/modules/events.lua:251>
[C]: in function 'destroy_entity’
radiant/modules/entities.lua:82: in function 'destroy_entity’
stonehearth/services/server/build/ladder_builder.lua:143: in function <stonehearth/services/server/build/ladder_builder.lua:124>
[C]: in function 'destroy’
stonehearth/services/server/build/ladder_manager.lua:71: in function '_destroy_builder’
stonehearth/services/server/build/ladder_builder.lua:456: in function '_check_if_valid’
stonehearth/services/server/build/ladder_builder.lua:326: in function '_update_build_mode’
stonehearth/services/server/build/ladder_builder.lua:115: in function <stonehearth/services/server/build/ladder_builder.lua:114>

Have been getting multiple scaffolding areas on the desert map, with clay buildings. On third building and all have failed to finish completion, from failure in scaffolding or workers not putting in the last few windows even though I have plenty in stock.