do you have a reliable reproduction to cause the crash + reboot?
getting debug
the immediate(?) reboot will make it harder to get the debug log. You can try adb logcat or logfox and hope that the error is logged before reset.
community/dev builds enable fetching the pstore logs that can have the prior reboot reasons logged after reboot - but I think you run official / stable.
as to find others with the same issue, the recent build-feedback threads can have reports, then there’s the camera-app tag in gitlab and there’s this recent camera-crash + reboot, but with an FP4.
if any one of you is able to reliable reproduce it (taking photos in quick succession?) and capture a logcat or pstore (I know, kind of advanced), that would clear things up.
If you move the destination directory to internal memory you’ll probably avoid it.