The behavior of the totem of undying has been completely reworked. Now when used, the item is not consumed, instead it shatters, becoming a destroyed version of itself. The shattered totem will not save you from death, instead it needs to stay in the player's inventory for 20 minutes to regenerate.
To balance this mechanic, the totem of undying is no longer dropped by evokers spawned in villager raids. Now, it's only obtainable in the woodland mansion evokers and in the ominous vaults from trial chambers, with the same rarity as the heavy core.