this i was a problem for a long time on LIVE. not sure if they ever fixed it (i remember sebilis and kedge being especially guilty of healers healing through the floor/ceiling).
my server exhibits this problem as well, so i'm sure its "global".
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.
Afaik player chars wont get aggroed through walls. So wouldnt it be enough to use the same piece of code that checks if a mob can see(=aggro) a player on the mob to be healed?
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