Summary: I ordered a garden lantern to be placed from the stockpile, and my Hearthians instead moved an already-placed garden lantern nearby over to the designated spot. Not sure how to reproduce, but see attached video.
Versions and mods:
No mods; latest release version in Steam at the time of writing, version 0.1.0 (release 393) x64, according to the title screen.
DxDiag 2015-06-07.txt (66.6 KB)