This seems to be tied specifically to the 'teleport' they do if they get stuck on terrain or otherwise end up too far behind. The bug doesn't always happen. I suspect a flag isn't getting set consistently, or something.
To recap, the merc was killing just fine. Monster health was dropping appropriately and they died when the hp bar reached zero. I was also killing just fine. The bug was that the monsters were completely ignoring the merc, in spite of the fact that he was there and he was killing them as per usual. Again, this only occurs after a merc 'teleports', or instantly moves from one place to another due to my being too far away from them.
Glad to hear this (so far) is addressed by the beta.
To recap, the merc was killing just fine. Monster health was dropping appropriately and they died when the hp bar reached zero. I was also killing just fine. The bug was that the monsters were completely ignoring the merc, in spite of the fact that he was there and he was killing them as per usual. Again, this only occurs after a merc 'teleports', or instantly moves from one place to another due to my being too far away from them.
Glad to hear this (so far) is addressed by the beta.