[Problem/Bug]: When attaching the ContextMenuRequest event to the PDF viewer, the Back, Forward, and Refresh items disappear.

What happened?

Winform .NET 4.7
Webview2 version 1.0.259251
For PDF file
When attaching the ContextMenuRequest event without doing anything, some items disappear (Back, Forward, Refresh).

When removing one item, for example, "Print," all remaining items no longer work except for Copy.

This event is also not handled when I right-click on the search box (I want to remove some items from the search box).

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime), Prerelease (Edge Canary/Dev/Beta)

Runtime Version

126.0.25.92.102

SDK Version

No response

Framework

Winforms

Operating System

Windows 10

OS Version

Enterprise LTSC 1809

Repro steps

1. Use sample of Winforms_GettingStarted
2. Add event ContextMenuRequest and remove item Print
3. Open PDF file
4. Right click on Page PDF
5. Right click on search box

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

No, this never worked

Last working version (if regression)

No response

Start with the Winforms_GettingStarted sample and reproduce the ContextMenuRequest behavior using a PDF, removing the Print item as described. Check the page context menu and the search box separately. Done means Back, Forward, Refresh, and other remaining items continue to work, and the event is handled for the search box.