Well, I checked it in 1.35 and the problem is still there. I must be one of the few noticing because I do use those staves. I don't know if the summon bear spell deserves so much trouble and after all I can fix it in my game editing the script, but...
Also, any plans on adding more artifacts to quest for? I still haven't found them all, but I love explore quests like this. The staff of Magnus was incredibly well modeled, and I also like the other, non-lore artifacts (specially the Sunblade)
I thought I had it fixed already..
if you want you can check the http://www.gamesas.com/bgsforums/index.php?s=&showtopic=893092&view=findpost&p=13886320 and edit the esp has needed and send them to me should just be armaartifacts.esp that has them. I may have made a mistake or two when edited myself.
More Artifacts to quest for? Maybe in the future, but, really not sure, There are plenty of New Item from Artifacts II that could be used, since all the Arma Stuff is accounted for after all Either in Leveledlist or in Artifacts Quests itself.