As title this "bug" should be a variation of a well-known issue of deconstructing door.
When deconstructing those "tier 2" building (that have prerequisite other than material to be built. e.g.: door, fireplace, table, etc.) the game will return a new terrain because the old one was not stored.
So if you build "Inside of a building" with materials with qualities and then build fireplace, etc. on it (except door that return the ground)
You will get normal boards after deconstructing the "new" Inside of a building generated by remove of tier 2 building.
Topic: A somewhat bug related to deconstruction (Read 5076 times)