WatchOS 6 TTS bug ? AXSpeechManager isSpeaking crash - ios13

Question

Here is the bug report. I think it's a bug of watchOS 6 something related to apple Text to Speech service.
When i not use tts, it's go away.
Incident Identifier: 3C86B3F2-0565-464C-921C-A0ECB63237EB
CrashReporter Key: 9de6d125d2514512fa87c39b4cc898e09cf8d8cc
Hardware Model: Watch4,4
Process: LeanWatchApp Extension [367]
Path: /private/var/containers/Bundle/Application/D8EC0163-C8EA-4375-B556-3C751744EEE3/LeanWatchApp.app/PlugIns/LeanWatchApp Extension.appex/LeanWatchApp Extension
Identifier: hltek.Lean.watchkitapp.watchkitextension
Version: 4 (1.15)
Code Type: ARM (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: hltek.Lean.watchkitapp.watchkitextension [473]
Date/Time: 2019-10-08 08:45:38.1157 +0800
Launch Time: 2019-10-08 08:42:38.0000 +0800
OS Version: Watch OS 6.0.1 (17R605)
Release Type: User
Baseband Version:
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000000195eb0c0
VM Region Info: 0x195eb0c0 is not in any region. Bytes after previous region: 553153 Bytes before following region: 104714048
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
Stack 194dc000-19564000 [ 544K] rw-/rwx SM=COW thread 5
---> GAP OF 0x6464000 BYTES
unused shlib __TEXT 1f9c8000-1f9ee000 [ 152K] r-x/r-x SM=COW ... this process
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [367]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_pthread.dylib 0x1fd6a670 pthread_get_qos_class_np + 8
1 Foundation 0x20adf988 -[NSThread qualityOfService] + 80
2 Foundation 0x20aa24e8 -[NSObject+ 271592 (NSThreadPerformAdditions) performSelector:onThread:withObject:waitUntilDone:modes:] + 272
3 Foundation 0x20aa43f4 -[NSObject+ 279540 (NSThreadPerformAdditions) performSelector:onThread:withObject:waitUntilDone:] + 116
4 libAXSpeechManager.dylib 0x437a88f0 -[AXSpeechManager isSpeaking] + 112
5 libAXSpeechManager.dylib 0x437a3c38 -[AXSpeechManager _didBeginInterruption] + 52
6 libAXSpeechManager.dylib 0x437a3fec -[AXSpeechManager _handleAudioInterruption:] + 500
7 CoreFoundation 0x200bb1d0 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
8 CoreFoundation 0x200bb218 ___CFXRegistrationPost1_block_invoke + 64
9 CoreFoundation 0x200ba580 _CFXRegistrationPost1 + 368
10 CoreFoundation 0x200ba24c ___CFXNotificationPost_block_invoke + 104
11 CoreFoundation 0x20037fec -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1392
12 CoreFoundation 0x200b9bc8 _CFXNotificationPost + 1188
13 Foundation 0x20a694c0 -[NSNotificationCenter postNotificationName:object:userInfo:] + 60
14 AVFAudio 0x2ac2048c -[AVAudioSession privateInterruptionWithInfo:] + 992
15 AVFAudio 0x2ac22c30 (anonymous namespace)::HandlePropertyListenerCallback+ 597040 (unsigned int, objc_selector*, NSObject*) + 72
16 libdispatch.dylib 0x1fb333a0 _dispatch_call_block_and_release + 24
17 libdispatch.dylib 0x1fb34730 _dispatch_client_callout + 16
18 libdispatch.dylib 0x1fb405a8 _dispatch_main_queue_callback_4CF + 992
19 CoreFoundation 0x200dbe6c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
20 CoreFoundation 0x200d6a10 __CFRunLoopRun + 740
21 CoreFoundation 0x200d6420 CFRunLoopRunSpecific + 464
22 GraphicsServices 0x236462ec GSEventRunModal + 100
23 UIKitCore 0x3ca1f784 UIApplicationMain + 1760
24 libxpc.dylib 0x1fdc4aa4 _xpc_objc_main.cold.3 + 208
25 libxpc.dylib 0x1fdb0a90 _xpc_objc_main + 212
26 libxpc.dylib 0x1fdb33e4 xpc_main + 152
27 Foundation 0x20aa663c +[NSXPCListener serviceListener] + 0
28 PlugInKit 0x298462f8 0x2982d000 + 103160
29 WatchKit 0x325c4f94 WKExtensionMain + 60
30 WatchKit 0x325c4fb8 main + 12
31 libdyld.dylib 0x1fb70a38 start + 4
It's very similar to this:
App is getting crashed on app launch in iOS 13 beta version
When make wrist down , the watch screen off ,It always crash. but my app is Workout app, it can work in background before watchOS 6.