If the project contains 'Easy Save' asset from the Asset Store, then Bolt is crashing on iOS devices.
You don't have to use ES in any capacity, just download it.
The fun part is, that as long as you don't actually use Bolt, everything is fine. The crash occurs only if the scene contains a flow graph doing literally anything (in my case changing the position at start).
Any operations like regenerating build options, regenerating inspectors, running AOT pre-built are irrelevant. Just the presence of Easy Save in the project causes EXC_BAD_ACCESS.
Easy Save might be to blame somehow too, but it seems more like something on your end. Please check it as ES is a popular tool and the crash is very very nasty - it gives no clues regarding the cause.
One thing to note - ES comes with two versions: ES2 and ES3 (backward compatibility I guess). I checked and it seems that only ES3 is conflicting with Bolt - might save you some time.
Attaching the screenshot from the crash:
Customer support service by UserEcho