Quest bug: The Undertaker's Apprentice

After taking the lamp i accidently clicked on the Mud and going back instantly. Now it seems that the game is ignoring, if i kill Haunted Packs at all. Cleared the Mud and the Tidal Island several times but the undertaker does not spawn to take me to the Nekropolis -.-

ANy advice....

btw: On my PS5 it worked quite well, so i know what to do in general to solve the first step of this Quest.

Solved. Just a couple of bad luck. A few Maps later it worked finally. Weard.....