What I really don't like about current delving system - it's so easy to screw things at start. Make few steps forward - stone disappears and you just get your regular mission. Forget to put gem inside - same story.

In situation when you talking in discord or have lags it's so easy to screw things, especially when you duo missions. That's why I prefer to complete them solo. Maybe we need some sort of warning window, like "if you step forward, you turn delving instance into normal instance. Are you sure?"