Ctrl+V accelerator and TextBox paste event not working when replacing TextBox ContextFlyout with custom menu with accelerators

[darenm]

Describe the bug

When replacing the TextBox default ContextFlyout with a custom MenuFlyout, Cut and Copy function as expected, but Paste does not . In the repro attached below, a custom MenuFlyout is attached to a TextBox and Paste no longer functions as expected - the Paste events is not raised, and the Ctrl+V chord is not passed to KeyPressed.

CopyPasteKeys.zip

Steps to reproduce the bug

1. Run the attached repro
2. Attempt to paste using Ctrl+V.

Expected behavior

Pressing Ctrl+V will raise the TextBox.Paste event and allow it to be Handled and the Ctrl+V chord will be available in the TextBox KeyPressed event.

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.4.2: 1.4.231008000

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response