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[gtmattz]

Okay, now that I went and downloaded that mod (since I don't use it), I was finally able to open up your save, and I found the problem.  There is an unmined floor near the southeast of the top floor (yes, a part that was chopped off from the images).  I'm re-engineering the collapse to see if it will work now, and as I suspected.

And it fell as expected, most of it only falling down one z-level.  Though there's a north-south line in the middle that was completely eradicated, and I don't know why.

I've gotten that north-south line when collapsing large chunks of terrain, so it's not just you. It gets filled in with grass eventually if it's on the surface.

I have gotten it on really small collapses even.  I routinely dam my underground river source via dropping a block of unmined stone into it, and occasionally I run into situations where the block splits no matter how I try and drop it or even if i change the shape etc.