I've been working in a similar environment, and once a month (or more) someone comes to me with a crash they don't understand. It usually takes a couple of days

I've been working in a similar environment, and once a month (or more) someone comes to me with a crash they don't understand. It usually takes a couple of days to debug (since the easy bugs don't make it to me), and every single one is some kind of undefined behavior (temporary lifetime confusion, dangling reference, callbacks modifying containers during caller iteration, ...)