It crashes any app including System Preferences or etc. Below is an example of crash log with my own app.
Last Exception Backtrace:
0 CoreFoundation 0x19fa6508c __exceptionPreprocess + 164 (NSException.m:249)
1 libobjc.A.dylib 0x19cd672e4 objc_exception_throw + 88 (objc-exception.mm:356)
2 CoreFoundation 0x19fa29140 -[__NSArrayM objectAtIndexedSubscript:] + 592 (NSArrayM.m:309)
3 UIKitCore 0x1a2fb6554 -[UIInputSwitcherView localizedTitleForItemAtIndex:] + 32 (UIInputSwitcherView.m:860)
4 UIKitCore 0x1a2fbda68 -[UIKeyboardMenuView customizeCell:forItemAtIndex:] + 384 (UIKeyboardMenuView.m:1392)
5 UIKitCore 0x1a2fb68ac -[UIInputSwitcherView customizeCell:forItemAtIndex:] + 88 (UIInputSwitcherView.m:914)
6 UIKitCore 0x1a2fb681c -[UIInputSwitcherView tableView:cellForRowAtIndexPath:] + 192 (UIInputSwitcherView.m:907)
Hello @erickwok, our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. I'd greatly appreciate it if you could open a bug report, include a sysdiagnose, and post the FB number here once you do. Bug Reporting: How and Why? has tips on creating your bug report.