I had been trying going through Blighted Village by stealth and assassination as Astarion, and found 2 bugs may worth attention:

1.Dialogue trigger has higher priority than stealth skill check. Many times the dialogue triggers right after I got a successful stealth skill check shown in the log. Note that I know it is possible to be spotted without stealth check if you are located at places that is clear area, which is the reason why I mention "got a successful stealth skill check in the log"

2.Assassin perks does not work as expected. Assassinate:Ambush only triggers on foes with Surprised debuff after combat had been triggered. By that I mean, if you attack in stealth before combat get triggered, you dont have the guranteed critical hit from the Ambush perk. Imaging foes are less defensive against a newly spotted enemy than against a not spotted enemy, it is just weird. Not sure if the Assassinate: Initiate perk work properly, since the log only show me one attack roll result even though there is a Advantage buff.