I also stumbled upon this recently. What helped me:
- right click on crash -> show in finder
- copy the .xccrashpoint file somewhere
- rename the file extension from .xccrashpoint to .crash
- Finder now sees it as a folder, and you can go to the .crash file that you need.
Then you need to symbolize the collapse. There are several ways to do this, but the easiest thing I know is:
- open window → Device Panel in xCode
- Click on the device (I had to connect an iPad) → open device logs
- drag and drop the .crash file.
- sort by date, find your failure, crash is now symbolized
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