I'm having the same issue.
App works fine when launched from Xcode, and even works fine when launched from Xcode as a release build. But when installed via Testflight, we get an immediate crash.
Here is the log:
Date/Time: 2021-12-08 13:29:31.3655 -0500
Launch Time: 2021-12-08 13:29:31.3603 -0500
OS Version: iPhone OS 15.1 (19B74)
Release Type: User
Baseband Version: 4.01.01
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Details: (terminated at launch; ignore backtrace)
Triggered by Thread: 0
Thread 0 Crashed:
0 dyld 0x000000010519c198 __abort_with_payload + 8
1 dyld 0x00000001051a1d5c abort_with_payload_wrapper_internal + 104 (terminate_with_reason.c:102)
2 dyld 0x00000001051a1d90 abort_with_payload + 16 (terminate_with_reason.c:124)
3 dyld 0x00000001051722b4 dyld4::halt(char const*) + 328 (DyldProcessConfig.cpp:2046)
4 dyld 0x000000010516f578 dyld4::prepare(dyld4::APIs&, dyld3::MachOAnalyzer const*) + 3280 (dyldMain.cpp:0)
5 dyld 0x000000010516da04 start + 488 (dyldMain.cpp:869)
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000006 x1: 0x0000000000000001 x2: 0x000000016b872d80 x3: 0x0000000000000098
x4: 0x000000016b872980 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000000
x8: 0x0000000000000020 x9: 0x0000000000000009 x10: 0x0000000000000001 x11: 0x000000000000000a
x12: 0x0000000000000000 x13: 0x0000000000000036 x14: 0x00000002159ac609 x15: 0x0000000000000000
x16: 0x0000000000000209 x17: 0x0000000105196830 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x000000016b872980 x21: 0x0000000000000098 x22: 0x000000016b872d80 x23: 0x0000000000000001
x24: 0x0000000000000006 x25: 0x000000016b873758 x26: 0x0000000000000001 x27: 0x0000000000000000
x28: 0x0000000000000000 fp: 0x000000016b872950 lr: 0x00000001051a1d5c
sp: 0x000000016b872910 pc: 0x000000010519c198 cpsr: 0x0
esr: 0x56000080 Address size fault
Binary Images:
0x105154000 - 0x1051abfff dyld arm64e <c21dba379df93fc7b286734030e18bb1> /usr/lib/dyld
EOF
There is no stack trace available in the crash.
I am downloading 13.2RC to see if this fixes it and will update.
The same thing is happening to us today!!
The app runs fine under Xcode on an iPad connected by wire to my MacBook.
When we publish the app in TestFlight, it crashes immediately with the same missing library.
We were also getting an automated email after each distribution on TestFlight: ITMS-90863: Apple silicon Macs support issue - The app links with libraries that are not present on Mac: @rpath/libswift_Concurrency.dylib
We were able to prevent these emails by navigating in AppStoreConnect to: App Store / Pricing and Availability / iPhone and iPad Apps on Apple Silicon Macs and un-checking "Make this app available"
My solution below works for me. Hope it helps