Interaction with Apple Pencil causes crash when app window is shown in Sidecar

When using an iPad device as Sidecar on Mac OS, interacting with an Apple Pencil on the app causes it to crash.

I've attached a really small example that replicates the problem. This example only contains a button in the center of the window.

After enabling sidecar, drag the Qt app window to the sidecar and use Apple Pencil to press the button and the app will crash.

The full stack trace is attached.