I have encountered some bugs in honour mode, I never had in a normal playthrough: Halsins quest to find Thaniels second half is bugged. Oliver seems to have vanished from the game now. I fought him after going through his portal and now , he is gone on both sides of the portal.
Have you by any chance attacked Oliver's shield directly during the fight?
Because I noticed if his shield is directly attacked he can bug out and not talk with you, in some cases even disappear entirely. Didn't have this issue though if I purely attacked his shadows.
