1 is not a bug, its a feature. The AI decks are hidden by default, there is a new checkbox making them show up again in deck edit. A lot of people don't care about the AI, and the decks are just clogging their list, so we decided to not make them show up.
As for 2, this is not possible currently. If you want to use the AI decks yourself, you'll have to copy them and save them under a different name not prefixed "AI_".