Bad Access in application:didFinishLaunchingWithOptions:

Colton

I'm having trouble tracking down a bug. Every so often a customer on an iOS 15+ device experiences a crash which is reported through Sentry error tracking. I am using Qt 5 with a custom AppDelegate. The exception is:

EXC_BAD_ACCESS: __cxa_guard_release > _setInvalidatesViewsOnAppearanceChange: > application:didFinishLaunchingWithOptions: >
KERN_INVALID_ADDRESS at 0x10.

When looking at the stacktrace, it never intersects with user-space code. How can I identify the line that caused it? What is __cxa_guard_release? Is it a known bug with Qt 5?
Here is the stacktrace reported by Sentry:
In QList<T>::Node::t > QObject::connect > std::__1::function<T>::operator() > QList<T>::swap > <redacted>