Today I encountered an unexpected behavior of the construction process. I tried to build a minehole. When I already had all the required materials in the construction sign and at the next moment the minehole should have emerged, the System said that "You cannot build on that type of terrain". The thing is that I tried to build it on unpaved ground and the game allowed me to place the construction sign on it. Usually the game doesn't allow to place a construction sign if the ground type isn't suitable. Since I was able to place it, I thought that it is OK to build here and delivered required resources. Now I'm starting to think that I've wasted 10 hardened leather and 15 ropes which took me almost 2 weeks to collect.
I use Amber Client.
I'm not sure if this is a bug or intended feature but maybe someone can clarify that.