Hello, Squares affected by Wall of Stone are not considered blocking terrain by Cautious Sneak : you can't move next to them. While I'm here, not sure if this is a bug or the intended way, but if you put 2 lava squares under a 2x2 monster, it only suffers damage for one of them...
Yes, it looks like Wall of Stone has a few issues. See, for example, this thread: https://forums.cardhunter.com/threa...ecognize-stone-wall-as-blocking-terrain.3859/ For terrain attachments vs 2x2 monsters, see http://www.cardhunter.com/how-to-play-card-hunter/#zeelar. It is working as intended.
I just had a game which I lost due to this issue. If cautious sneak had worked properly with wall of stone, I would have lasted another turn at least.