Originally posted by Brew:

I never get full materials back from campfires; I always lose the 2 wood but get back the stone. I feel like I've always lost a bit of wood from wooden building parts (floors, walls, etc), but always got full materials back from crafting stations, portals, boats, stone building parts. Not sure why the inconsistencies...

All buildings that intake fuel like campfires (wood), torches (resin), braziers (coal) will not drop their fuel source after being created. Everything else will drop 100% of materials, just make sure you pick all of them up after dismantling.

Not sure why this is, but it could be to prevent the duplication of fuels or something.