Update: The bug has been fixed and Arena is re-enabled.
Quick announcement, Blizzard has temporarily deactivated Arena game mode because of unforeseen issues with the patch. While I haven’t tested it myself, it looks like all of the random card generation (including Discover) only used the Legendary card pool. Because of that many cards simply didn’t work (for example Babbling Book, because there are no Legendary Mage spells in rotation) and others gave you a lot of Legendaries.
I hope that the bug gets patched quickly and Arena gets re-opened. I’ll keep you updated!
Due to unforeseen issues with the latest patch, we’ve temporarily deactivated Arena Mode while we resolve the problem. Thank you for bearing with us.
— Hearthstone (@PlayHearthstone) August 20, 2024
There is a much bigger bug, no px for play, no achievement progress and no quest progress. Indie company strikes again
False alarm, seems you need to reload the game to actually have xp, still weird