You could set all your maps to be non-wrapping. That wouldn't fix the problem, so much as avoid it, though. And it would ruin half the fun of craft-crashing.

One thing I noticed about the level seam problems, is that it mostly kills your actors if they're interacting with the ground as they slowly go across. If you fly over the seam, it seems less likely to cause harm. So you could make a habit of doing that.

yes i've noticed that, usually my actors only die from this if i'm going through a tunnel.