So, I took Devil's Sight for my warlock character specifically to be able to function in magical darkness. Just discovered in fight in the goblin village with the hobgoblin warlord and its minions that Devil's Sight doesn't work - I had a darkness spell cast on my warlock, and now he's "blinded", and that choice of an invocation was obviously wasted. Would love to see you fix it, because there's a reason for it in the game, but I'm going to have to start over, again.
BTW, thanks. I played BG & BG2 back in the day (and a lot since it was ported to Android, and made a great game for tablets.) Have been looking forward to a continuation for a long time. Also very much enjoying you doing your best to adhere to 5e ruleset. Makes it much easier and more fun, at least for me.

Essentially all the vision enhancing spells and items seem buggy at best. I believe this to be fairly well known, I'm not sure when/if this will change. Stay tuned!