I've seen this error also, but I usually don't tend to run into it *too* often (about 1 in 5-10 critters) and when I do, it's mobs that appear 'static'. I think they're stuck under the world but are showing on top of the world anyway.
If your map files aren't loaded, you'll see critters walking around (possibly in the wrong areas of the zone) and not aggroing until you attack (makes it real easy to hunt down critter and eat them up 1 by 1, but it's kinda silly).
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