[Problem/Bug]: Default context menu items disappear from PDF viewer when using ContextMenuRequested event

What happened?

The default context menu items Back, Forward, and Refresh disappear from the context menu of the PDF viewer when an event handler is added to the CoreWebView2.ContextMenuRequested event.
This occurs even when an empty event handler is used.

view.CoreWebView2.ContextMenuRequested += (s, args) => { };

Before:

After:

Importance

Moderate. My app's user experience is affected, but still usable.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

139.0.3405.102

SDK Version

1.0.3240.44

Framework

Winforms

Operating System

Windows 11

OS Version

26100.4652

Repro steps

Add an empty event handler to the CoreWebView2.ContextMenuRequested event and open a PDF file.

view.CoreWebView2.ContextMenuRequested += (s, args) => { };

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

No response