ARKit App Crashes on launch with appstore review, not on device - ios

Question

The appstore review team told me that the app was crashing on launch.
I believe the app was crashing at didFinishLaunching:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
guard ARWorldTrackingConfiguration.isSupported else {
fatalError("""
ARKit is not available on this device. For apps that require ARKit
for core functionality, use the `arkit` key in the key in the
`UIRequiredDeviceCapabilities` section of the Info.plist to prevent
the app from installing. (If the app can't be installed, this error
can't be triggered in a production scenario.)
In apps where AR is an additive feature, use `isSupported` to
determine whether to show UI for launching AR experiences.
""") // For details, see https://developer.apple.com/documentation/arkit
}
return true
}
However, the app can only be installed on a device which supports ARKit, so I am not sure how apple was able to replicate this on a iOS13 device, as the UIRequiredDeviceCapability includes an ARKit entry in the .plist. Is it possible they are running the app on a device without this capability? Is the app actually crashing because of the fatalerror call?
Here is the crashlog that I was only partially able to symbolicate:
Date/Time: 2019-10-06 13:10:04.9570 -0700
Launch Time: 2019-10-06 13:10:04.7508 -0700
OS Version: iPhone OS 13.1.2 (17A860)
Release Type: User
Baseband Version: 9.00.01
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001a62abefc
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [561]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libswiftCore.dylib 0x00000001a62abefc 0x1a609e000 + 2154236
1 libswiftCore.dylib 0x00000001a62abefc 0x1a609e000 + 2154236
2 libswiftCore.dylib 0x00000001a60c764c 0x1a609e000 + 169548
3 ARC2500A 0x0000000100fcc6c8 #objc AppDelegate.application(_:didFinishLaunchingWithOptions:) + 83656 (AppDelegate.swift:0)
4 UIKitCore 0x000000019cf76ebc 0x19c590000 + 10383036
5 UIKitCore 0x000000019cf78c8c 0x19c590000 + 10390668
6 UIKitCore 0x000000019cf7e4c0 0x19c590000 + 10413248
7 UIKitCore 0x000000019c75a810 0x19c590000 + 1878032
8 UIKitCore 0x000000019cbeb3ec 0x19c590000 + 6665196
9 UIKitCore 0x000000019c75b2f8 0x19c590000 + 1880824
10 UIKitCore 0x000000019c75ae04 0x19c590000 + 1879556
11 UIKitCore 0x000000019c75b124 0x19c590000 + 1880356
12 UIKitCore 0x000000019c75a9e0 0x19c590000 + 1878496
13 UIKitCore 0x000000019c75eefc 0x19c590000 + 1896188
14 UIKitCore 0x000000019cb1e028 0x19c590000 + 5824552
15 UIKitCore 0x000000019cc045ac 0x19c590000 + 6768044
16 UIKitCore 0x000000019c75ec34 0x19c590000 + 1895476
17 UIKitCore 0x000000019cc044a8 0x19c590000 + 6767784
18 UIKitCore 0x000000019c75eaa0 0x19c590000 + 1895072
19 UIKitCore 0x000000019c5d3efc 0x19c590000 + 278268
20 UIKitCore 0x000000019c5d2a64 0x19c590000 + 272996
21 UIKitCore 0x000000019c5d3c34 0x19c590000 + 277556
22 UIKitCore 0x000000019cf7c840 0x19c590000 + 10405952
23 UIKitCore 0x000000019cb3ea0c 0x19c590000 + 5958156
24 FrontBoardServices 0x000000019e00b994 0x19dfff000 + 51604
25 FrontBoardServices 0x000000019e030960 0x19dfff000 + 203104
26 FrontBoardServices 0x000000019e0160f8 0x19dfff000 + 94456
27 FrontBoardServices 0x000000019e03061c 0x19dfff000 + 202268
28 libdispatch.dylib 0x0000000198c40184 0x198be4000 + 377220
29 libdispatch.dylib 0x0000000198be9038 0x198be4000 + 20536
30 FrontBoardServices 0x000000019e055540 0x19dfff000 + 353600
31 FrontBoardServices 0x000000019e05520c 0x19dfff000 + 352780
32 FrontBoardServices 0x000000019e055734 0x19dfff000 + 354100
33 CoreFoundation 0x0000000198ef07e0 0x198e47000 + 694240
34 CoreFoundation 0x0000000198ef0738 0x198e47000 + 694072
35 CoreFoundation 0x0000000198eefed0 0x198e47000 + 691920
36 CoreFoundation 0x0000000198eeb01c 0x198e47000 + 671772
37 CoreFoundation 0x0000000198eea8bc 0x198e47000 + 669884
38 GraphicsServices 0x00000001a2d56328 0x1a2d53000 + 13096
39 UIKitCore 0x000000019cf806d4 0x19c590000 + 10421972
40 ARC2500A 0x0000000100fc3010 main + 45072 (TableVC.swift:13)
41 libdyld.dylib 0x0000000198d75460 0x198d74000 + 5216
Thread 1 name: Dispatch queue: com.apple.root.background-qos
Thread 1:
0 libsystem_kernel.dylib 0x0000000198d6acb4 0x198d46000 + 150708
1 libsystem_pthread.dylib 0x0000000198c88d8c 0x198c84000 + 19852
2 libsystem_pthread.dylib 0x0000000198c88d5c 0x198c84000 + 19804
3 CoreFoundation 0x0000000198ecc2f4 0x198e47000 + 545524
4 CoreFoundation 0x0000000198ecb4dc 0x198e47000 + 541916
5 libdispatch.dylib 0x0000000198c3f610 0x198be4000 + 374288
6 libdispatch.dylib 0x0000000198c40184 0x198be4000 + 377220
7 libdispatch.dylib 0x0000000198bf5104 0x198be4000 + 69892
8 libdispatch.dylib 0x0000000198bf579c 0x198be4000 + 71580
9 libsystem_pthread.dylib 0x0000000198c8ff64 0x198c84000 + 48996
10 libsystem_pthread.dylib 0x0000000198c92ae0 0x198c84000 + 60128
Thread 2:
0 libsystem_pthread.dylib 0x0000000198c92ad8 0x198c84000 + 60120
Thread 3:
0 libsystem_pthread.dylib 0x0000000198c92ad8 0x198c84000 + 60120
Thread 4:
0 libsystem_pthread.dylib 0x0000000198c92ad8 0x198c84000 + 60120
Thread 5 name: com.apple.uikit.eventfetch-thread
Thread 5:
0 libsystem_kernel.dylib 0x0000000198d495f4 0x198d46000 + 13812
1 libsystem_kernel.dylib 0x0000000198d48a60 0x198d46000 + 10848
2 CoreFoundation 0x0000000198ef0068 0x198e47000 + 692328
3 CoreFoundation 0x0000000198eeb188 0x198e47000 + 672136
4 CoreFoundation 0x0000000198eea8bc 0x198e47000 + 669884
5 Foundation 0x000000019922a994 0x199223000 + 31124
6 Foundation 0x000000019922a874 0x199223000 + 30836
7 UIKitCore 0x000000019d01849c 0x19c590000 + 11043996
8 Foundation 0x000000019935b0b0 0x199223000 + 1278128
9 libsystem_pthread.dylib 0x0000000198c8f1ec 0x198c84000 + 45548
10 libsystem_pthread.dylib 0x0000000198c92aec 0x198c84000 + 60140
Thread 6:
0 libsystem_pthread.dylib 0x0000000198c92ad8 0x198c84000 + 60120
Thread 7:
0 libsystem_pthread.dylib 0x0000000198c92ad8 0x198c84000 + 60120
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x8000000100fd0130 x1: 0x0000000000000407 x2: 0x0000000000000407 x3: 0x000000000000002b
x4: 0x0000000107f05230 x5: 0x0000000000000026 x6: 0x0000000000000000 x7: 0x0000000000000c70
x8: 0x0000000000000000 x9: 0x00000000000295b0 x10: 0x00000000000d29d0 x11: 0x0000000000179f41
x12: 0x0000000107f04000 x13: 0x0000000000003fff x14: 0x00000000b71ada31 x15: 0x000000000000080c
x16: 0x0000000198c7e040 x17: 0x000000000000080c x18: 0x0000000000000000 x19: 0x0000000100fd0142
x20: 0x0000000000000002 x21: 0x0000000000000000 x22: 0x0000000000000014 x23: 0x0000000000000000
x24: 0x8000000100fd0130 x25: 0x000000000000000b x26: 0xd0000000000001cb x27: 0x0000000000000051
x28: 0x00000001dc5d1000 fp: 0x000000016ee455d0 lr: 0x00000001a62abefc
sp: 0x000000016ee45550 pc: 0x00000001a62abefc cpsr: 0x60000000
esr: 0xf2000001 Address size fault

Answer 1

Here is an important note from the Apple docs for the isSupported property.
Discussion
Different types of AR experiences (which you configure using concrete
ARConfiguration subclasses) can have different hardware requirements.
Before attempting to create an AR configuration, verify that the
user’s device supports the configuration you plan to use by checking
the isSupported property of the corresponding configuration class. If
this property’s value is false, the current device does not support
the requested configuration.
Important
All ARKit configurations require an iOS device with an A9 or later
processor. If your app otherwise supports other devices and offers
augmented reality as a secondary feature, use this property to
determine whether to offer AR-based features to the user.
If your app requires ARKit for its core functionality, use the arkit
key in the UIRequiredDeviceCapabilities section of your app's
Info.plist to make your app available only on devices that support
ARKit.
Conclusively, this means that the test device used by Apple Store Review does not support ARWorldTrackingConfiguration subclass of ARConfiguration. Probably they use a device with below an A9 processor or they used an iOS version older than 11.0 to test the app.
Otherwise,
In the Info.plist, make sure in your UIRequiredDeviceCapability, you have the arkit entry all in small caps.