Unsure if this applies to other card generation as I haven’t noticed issues with other cards today, but the card generation issue fixed yesterday is a problem again at least for Azsharan Scroll/Sunken Scroll in Arena. Playing Azsharan Scroll does not offer a discover, but it does produce a Sunken Scroll as expected. Playing the Sunken Scroll also does not give a card as it should.
Class was Paladin with Shaman hero power. Deck drafted around 7pm EST on 8/21/24 and failed discovers happened in the first game I played with it.
Editing to say: Behavior still happening for me, but my opponent discovering a card from my deck as a Mage with Druid hero power they were able to receive a spell from Sunken Scroll.