Mobs healing through walls and pet aggro

[Irreverent]

A pain on my server is that mobs can heal through walls, then of course the pets go crazy and attack them whever they are and can cause some train issues.

Is this a local issue for me(then what did i do, heh) or does every server have this issue? If so, sounds like a quick change to the script to check for LoS before a mob heals. Because trying to modify aggro script might a pain.