I kill Captain egeissag in Sendais enclave but game doesn't think I did.

I accept the terms from the beholder to fight Captain Egeissag. I kill him but the beholder leaves and drow attack me. The door is locked and all my people die. Is this a known bug? Thanks.
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Did you kill him in any "non-standard" way like imprisonment or int-drain? The game sometimes doesn't recognize that.
Try again? You should have at least an autosave from before entering his room.