Still no luck getting this bug to occur. When the mission has failed, I've tried:
1) Restart from home (in the mission failed menu)
2) Going back to main menu, then loading in the autosave (in the mission failed menu)
3) Pressing escape to bring up the menu, and loading the autosave from there
None of these routes has caused the bug to occur, which makes it difficult to solve. If memory serves, you are on Mac? There is a possibility that the issue is specific to Mac, or to a subset of Macs, or even a subset of computers running different operating systems. With so many hardware and software configs, it can happen. I'll try to recreate on my Mac when I'm testing the builds, using a development build so I will have access to debugging info. If I'm missing something, or doing something wrong in trying to recreate, please let me know and I'll investigate further.
I'll also look at holding the last 2 autosaves in order to prevent issues with data corruption.