I've posted something on facebook group and found out that I'm not alone with this.

Almost every enemy everywhere has golden true damaga block shield. I'm sure that doesn't come from any talisman. Although I can deal with it so far like on the Arena or Cosmos battles, but it becomes a real pain in the a... you know... on upper floors of Brave New World and against tougher teams on Arena and Gauntlet making BNW Gardens impossible to auto-play.

I've reported this to suppirt via e-mail but wanted to post it here in hope of faster reaction because "arena event".