I think it is intentional. Also renouncing Bhaal 's heritage, the game ends after becoming the absolute. (With patch 5)
There's also an error in the normal ending, as the Durge (rejected Bhaal) reflects on the murders he/she committed in the past. The worst and most painful of the memories was killing Shadowheart. But I resisted the urge and didn't kill her. And she's also on the afterparty alive and kicking.
