My iOS application opens through Flutter, hands control to a Unity-built AR scene, and is compiled in Xcode. Tapping the “AR” menu reliably locks the interface; the 3D models never appear and the whole app hangs until the OS kills it. Xcode’s run log shows file-level thread errors, but there are no meaningful Unity or Flutter logs at the point of failure. I need you to trace the race/deadlock, patch whatever is blocking the main thread, and hand back a build that launches the AR session smoothly every time. A working solution has to be in my hands no later than Tuesday the 20th, so a quick turnaround and clear communication are essential. Deliverables • Fixed project (Unity + Flutter modules and Xcode workspace) that runs the AR menu without freezing • A concise report summarising the root cause, the code changes, and any steps I must follow for future builds If you have deep experience juggling Unity as a Library, Flutter channel calls, and Xcode thread debugging, I’m ready to share the repo and get started right away.