After performing the update to 20.0.0.77662 and receiving the new Golden Packs and Golden Cards (for original classic cards), I discovered that I had 2 duplicate legendary cards. I set my filter to legendary and went through every set, including the Wild Set, but could find no duplicates. That leaves very worried that the game has flagged two legendary cards that are not actually duplicates. It also makes me wary of using the duplicate finder in the immediate future.
Same for me, it said I had two duplicates… however, I disenchanted since it’s suppose to be a duplicate. I haven’t noticed any missing legendary cards and I have them all.
I had the same too. Can’t figure out what they are.
Edit: I think they are Ol Murk Eye and something else. I seem to remember getting Murk Eye awarded to me (again) the other day. Seems to be a bug with the new classic stuff.
I’m also having a similar issue to this. I was able to find the cards that have been rewarded to me. I originally had obtained the Demon Hunter Initiate set all over again, doubling each of those cards. After I leveled my Warlock to level 45 or so, I obtained each unlockable Warlock card from the Basic set again. This happened all after I opened my pre-release packs.