Hmm, from your words I take it you accepted the quest from Raelis in the playhouse to free Haer' Daelis, right? So that's not it...
Note there are more secret entrances from the Sewers, but I take that's not it either... Hmm, when you enter his lair, you should head south, not west, in case that happened here. Makreth should be waiting at the end of a winding road.
Else it's indeed a bug, cause it's certainly not a time related quest.
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