In my experience with this bug, what triggers the crash is an *unusually* sized image or video. That is, if an image happens to be something like 780 x 421 (just as an example) instead of a more common resolution, like 780 x 420. I often have this problem with video, too – for instance, when creating a screen capture video, if I fail to capture it at a common resolution or fail to re-process the resulting video to a common resolution before bringing it into FCP, the crash is practically guaranteed.
I believe that I *may* have also seen the crash with images that are simply very large, too, but try playing around with the dimensions a bit.
It’s a big pain in the butt and I’ve not heard peep from Blackmagic about a fix.