Building several custom templates + roads to connect the doors

Summary: I was building several basic templates for small villager houses when I encountered an error that (as of yet) does not seem to have caused a problem, but I have yet to resume my game to fund out if a problem has occurred.

Steps to reproduce: Building several templates of a custom nature in a small area on my map, connected by roads.

Expected Results: A normal town of symmetrical nature.

Actual Results: As far as I can tell, exactly what I expected.

Notes: As far as I can tell, nothing of note.

Attachments: Screencap and clipboard: http://i.imgur.com/cCAh506.png

develop-3349 (x64)
std::logic_error: 'invalid reference in native get_id’
stack traceback:
radiant/modules/common.lua:255: in function 'report_traceback’
radiant/modules/common.lua:266: in function <radiant/modules/common.lua:260>
[C]: in function ‘get_id’
…onehearth/components/building/building_component.lua:2112: in function ‘_compute_fixture_dependencies’
…onehearth/components/building/building_component.lua:682: in function ‘_finish_set_building_active’
…onehearth/components/building/building_component.lua:1815: in function ‘_compute_scaffolding_worker’
…onehearth/components/building/building_component.lua:1736: in function 'fn’
radiant/controllers/nonpersistent_timer.lua:56: in function 'fire’
radiant/controllers/time_tracker_controller.lua:82: in function <radiant/controllers/time_tracker_controller.lua:82>
[C]: in function 'xpcall’
radiant/modules/common.lua:275: in function 'xpcall’
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:275: 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>

Version Number and Mods in use: No mods, version number 0.21.0 (develop 3349) x64 build (Steam beta update enabled, windows 10 most updated as of March 14th, 2017).

System Information: http://i.imgur.com/mYkHwDg.png