Should be fixed by the Greyface
Yeah just installed it and there they were
[s]I remember playing the game from the original disks many years ago, and they spawned even though I was following the Light path. And I was able to complete the Light quest to retrieve soul jars by presenting those (saving myself a trip to the Pit). I am now using the GOG version with the Greyface patch, and they no longer spawn in the Walls of Mist. But presumably they'll spawn if I choose the Dark path.[/s]
Edit: I was wrong, it wasn't in the Walls of Mist that I found those jars. I realised as I was exploring the Nighon tunnels in my current playthrough. In those tunnels there is a crate of soul jars for a mission on the Dark path, but you can use them to complete the Light path quest, so you won't have to go through the Pit.