I'm sure you're using the proper map files, but check around for updates. There was a handful of zone maps updated recently (last year) for some of the GoD+ zones, and I think some of the older ones too. Can't remember.
But I confirm, mobs have always had an innate ability to heal, aggro, and even attack you through solid rock/walls in Live. I haven't played recently, so I cannot say if they fixed it there.
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