Okay so maybe I'm just not getting how stealth works now but:
I absolutely cannot keep myself hidden.
I have expertise in sealth, with 18 dex.
When I hide outside of a vision cone, the enemies know exactly where I am and just attack me anyway. I noticed a white ghostly version of myself which I assume is where the enemies last saw me stealth. Doesn't matter. They zero in right on me anyway even after I've moved away from that in one turn.
When doing this, I made sure to stay inside the shadows (no i'm not trying to hide in broad daylight, i'm paying attention to the light levels)
If I'm currently stealthed, and I end up entering an enemy vision cone (be it me or the enemy moving) there is no stealth check. I do not roll to see if I've been seen. I am just automatically seen and stand up from hiding and thus cue being merc'd.
Am I just terrible at stealth or is there a bug happening somewhere?
TL:DR: Hiding doesn't matter and I may as well not even be stealthy.
+1. What is the point is a stealth skill if you don't even get to roll to see if you remain hidden?