Problem found (hopefully), after a *lot* of trial and error and experimentation.
On a hunch, I tried taking the graphics settings all the way down and tried the stock photo recon single mission and it played without crashing twice. After that, and some more reading, I tried out the hack that lets sh4 use more than 2 gb of memory and turned the graphics settings back to max. I ran the photo recon mission a couple more times and it hasn't crashed again, so it seems to be fixed.
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