Assistance Deciphering this Apple Crash Log? Not Reproducible

Been attempting to decipher these (already symbolicated) crash logs from Apple's App Review Department. They allege that our app crashes on a 12.1 iOS iPad device, however we've done testing on an iPhone 5, 6, 7, and 8, along with a 12.9 inch iPad, all of which are running iOS 12.1, with no issues at all.

In looking these logs over, all I can tell is that perhaps the Exception is related to them using our app with AirPlay, but I'm unsure of that. Furthermore, the thread that failed (Thread 25) also references that streaming service in other discussions on the topic, some of which are found on StackOverflow. Can anyone shed some light on what might be going on here?

Some general facts:

• Our app is an AR application

• Created in Unity 2018.2.14f1

• Running Vuforia 7.5.26

• Utilizing On-Demand Resources to deal with some app size issues

The crash log:

{"app_name":"St-Onge-AR","timestamp":"2018-12-04 09:54:33.50 -0800","app_version":"0.6.10","slice_uuid":"06cf09b4-b472-3983-90d7-e991ed4b4886","adam_id":1444222611,"build_version":"2","bundleID":"com.StOngeCompany.St-Onge-AR","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 12.1 (16B92)","incident_id":"08BBA5AA-38EC-48D0-B2F4-DC286E2F44F5","name":"St-Onge-AR"}
Incident Identifier: 08BBA5AA-38EC-48D0-B2F4-DC286E2F44F5
CrashReporter Key:   bef64d08f7ae65ad69e6c0a94330bf5b1c1ba374
Hardware Model:      xxx1
Process:             St-Onge-AR [64447]
Path:                /private/var/containers/Bundle/Application/9C70D117-C072-4791-B1A9-D13884ACEC41/St-Onge-AR.app/St-Onge-AR
Identifier:          com.StOngeCompany.St-Onge-AR
Version:             2 (0.6.10)
AppStoreTools:       10B63
Code Type:           ARM-64 (Native)
Role:                Non UI
Parent Process:      launchd [1]
Coalition:           com.StOngeCompany.St-Onge-AR [5444]


Date/Time:           2018-12-04 09:54:33.1797 -0800
Launch Time:         2018-12-04 09:53:54.0798 -0800
OS Version:          iPhone OS 12.1 (16B92)
Baseband Version:    n/a
Report Version:      104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000088
VM Region Info: 0x88 is not in any region.  Bytes before following region: 4344954744
      REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                 0000000102fac000-0000000102fb0000 [   16K] r-x/r-x SM=COW  ...pp/St-Onge-AR

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [64447]
Triggered by Thread:  25

Thread 25 name:  UnityGfxDeviceWorker
Thread 25 Crashed:
0   libsystem_pthread.dylib         0x0000000237c10eec pthread_mutex_lock$VARIANT$mp + 0
1   libc++.1.dylib                  0x0000000237194b30 std::__1::mutex::lock+ 248624 () + 12
2   St-Onge-AR                      0x0000000103984038 StateHolder::hasStateBeenSet() + 10321976 (StateHolder.cpp:172)
3   St-Onge-AR                      0x0000000103989d68 VuforiaRenderEvent + 10345832 (Tracker.cpp:762)
4   St-Onge-AR                      0x000000010341caa8 GfxDevice::InsertCustomMarkerCallback(void (*)(int), int) + 4655784 (GfxDevice.cpp:1826)
5   St-Onge-AR                      0x00000001035e3744 GfxDeviceWorker::RunCommand(ThreadedStreamBuffer&) + 6518596 (GfxDeviceWorker.cpp:1524)
6   St-Onge-AR                      0x00000001031f6eb0 GfxDeviceWorkerAutoreleasePoolProxy + 2404016 (GfxDeviceMetal.mm:3867)
7   St-Onge-AR                      0x00000001035e7858 GfxDeviceWorker::RunExt(ThreadedStreamBuffer&) + 6535256 (GfxDeviceWorker.cpp:152)
8   St-Onge-AR                      0x00000001035e0428 GfxDeviceWorker::RunGfxDeviceWorker(void*) + 6505512 (GfxDeviceWorker.cpp:444)
9   St-Onge-AR                      0x00000001033d6d14 Thread::RunThreadWrapper(void*) + 4369684 (Thread.cpp:42)
10  libsystem_pthread.dylib         0x0000000237c172ac _pthread_body + 128
11  libsystem_pthread.dylib         0x0000000237c1720c _pthread_start + 48
12  libsystem_pthread.dylib         0x0000000237c1acf4 thread_start + 4


Thread 25 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000088   x1: 0x00000001031f2f30   x2: 0x0000000000000067   x3: 0x00000001058539c0
    x4: 0x000000010318cb60   x5: 0x0000000000000010   x6: 0x0000000281206228   x7: 0x0000000000000000
    x8: 0x0000000103989d5c   x9: 0x0000000103989f20  x10: 0x0000000000000004  x11: 0x0000000000000000
   x12: 0x00000000000000e1  x13: 0x0000000000000001  x14: 0x00000000000000fd  x15: 0x000000000000007c
   x16: 0x0000000237c10eec  x17: 0x000000023a1afbbc  x18: 0x0000000000000000  x19: 0x0000000000000000
   x20: 0x0000000000000088  x21: 0x000000010a7fc010  x22: 0x0000000103989cf4  x23: 0x000000010585cfa0
   x24: 0x000000000000001c  x25: 0x0000000000000000  x26: 0x000000010a908040  x27: 0xd09ac4043e2800b9
   x28: 0x00000000000027b0   fp: 0x000000016dd92b60   lr: 0x0000000237194b30
    sp: 0x000000016dd92b60   pc: 0x0000000237c10eec cpsr: 0x80000000