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Basically, in my game, when waiting for Kastav Munia to make his way to the predestined meeting point at the docks mentioned in the quest, he seems to set off but then almost invariably get stuck on the sign outside Peladia Varousha's armorer shop. If I use the RA command enough, I am able to eventually get him to scoot past it, but that's only if I'm lucky.
However, once he reaches the docks where the Telvanni agent is waiting, nothing actually seems to happen. They stand there until 1am, at which point I fail the quest. Getting too close to them gets me spotted, which also causes me to fail.