Exactly, when creating a random map, due to a flaw by the developers, you will never be able to obtain the Earth skill and some other skills in the hut. They are excluded from the possible skills that can be generated when creating a random map. This was not intended by the developers, but nevertheless, that's how it turned out. Therefore, this phenomenon can be attributed to a bug.
I've known about this flaw for a long time; I can't quite bring myself to call it a bug. On fixed maps, we made all skills available, except for diplomacy and some other useless ones. Why not fix it for random maps as well?!
