When a custom tool items set is formed in PKToolPicker with each inking item having non-nil identifier created using PKToolPickerInkingItem(type: ,color:,width:,identifier: ), changing color or width of an inking item (pen, pencil etc) causes an instant crash. I believe it is a bug in PencilKit. It seems that when you change the color or width of an inking item having a identifier in squeeze tool palette, it tries to find a tool item without identifier (the default tool picker has items without identifier) in the tool items set. I guess it cannot find, thus the find function returns either -1 or highest integer number (2^63 -1 ) and it uses this number as index without boundary checking. That's why we observe [__NSArrayM replaceObjectAtIndex:withObject:]: index 9223372036854775807 beyond bounds [0 .. 9] I filed a report on Feedback Assistant with id: FB15519801 too. The corresponding part in crash report is as follows: 0 CoreFoundation 0x183e0908c __exceptionPreprocess + 164 (NSException.m:249) 1 libobjc.A.dylib 0x18110b2e4 objc_exception_throw + 88 (objc-exception.mm:356) 2 CoreFoundation 0x183de4048 -[__NSArrayM replaceObjectAtIndex:withObject:] + 1020 (NSArrayM.m:180) 3 PencilKit 0x1c44f73c8 -[PKToolPicker _setSelectedTool:saveState:updateUI:updateLastSelectedTool:] + 800 (PKToolPicker.m:587) 4 PencilKit 0x1c45a5684 -[PKPencilSqueezeControllerPaletteViewDelegateProxy paletteView:didSelectTool:atIndex:] + 200 (PKPencilSqueezeControllerPaletteViewDelegateProxy.m:227) 5 PencilKit 0x1c460906c -[PKSqueezePaletteView _didSelectTool:atIndex:] + 196 (PKSqueezePaletteView.m:441) 6 PencilKit 0x1c462203c -[PKSqueezePaletteViewExpandedInkingToolLayout _didTapStrokeWeightButton:] + 336 (PKSqueezePaletteViewExpandedInkingToolLayout.m:224) 7 UIKitCore 0x18691edd8 -[UIApplication sendAction:to:from:forEvent:] + 100 (UIApplication.m:5797) 8 UIKitCore 0x18691ecb0 -[UIControl sendAction:to:forEvent:] + 112 (UIControl.m:942) 9 UIKitCore 0x18691eb00 -[UIControl _sendActionsForEvents:withEvent:] + 324 (UIControl.m:1013) 10 UIKitCore 0x187080568 -[UIButton _sendActionsForEvents:withEvent:] + 124 (UIButton.m:4192) 11 UIKitCore 0x187081d7c -[UIControl touchesEnded:withEvent:] + 400 (UIControl.m:692) 12 UIKitCore 0x1868675b0 -[UIWindow _sendTouchesForEvent:] + 852 (UIWindow.m:3313) and the exception reason is *** -[__NSArrayM replaceObjectAtIndex:withObject:]: index 9223372036854775807 beyond bounds [0 .. 9]

Hi, I have an app using PencilKit that works on VisionOS 1.0. It means, a user can pick an inking tool from PKToolPicker and draw on PKCanvasView. The app is now on available on Vision Pro AppStore as well. However, when I test the app on VisionOS 1.1 RC Simulator, I can pick an inking tool but when I try to draw on the canvas, it just scrolls and no drawing appears on the PKCanvasView. I also noticed that the VisionOS 1.0 Simulator has the FreeForm app where you can draw with PencilKit but the VisionOS 1.1 RC Simulator does not have the FreeForm app. Is this a known issue? Will it be fixed before the release or is there a change in API so I can update the app accordingly? Thanks Zafer