[Problem]: Impossible to use GetFavicon in synchronous manner

What happened?

The callback provided to GetFavicon is never called when waiting for the result by entering the message-loop.

Example Code:

web_view15->GetFavicon(COREWEBVIEW2_FAVICON_IMAGE_FORMAT_PNG,
                                                       Callback<GetFavicon>(callback).Get());

// Wait for the result and call PeekMessage continuously

Is it possible to somehow get the favicon in a synchronous manner? As we've seen above, entering the message loop does not help - Is there something else we're supposed to do? The callback is triggered when not waiting for the result.

Importance

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

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

126.0.2592.113

SDK Version

1.0.2592.51

Framework

Win32

Operating System

Windows 10

OS Version

19045.4529

Repro steps

• Call GetFavicon
• Wait for result to be ready by handling remaining messages via PeekMessage

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 Win32 repro using GetFavicon, its callback, and the PeekMessage wait loop. Verify whether the callback contract supports synchronous waiting and identify the documented supported pattern or API behavior; the issue is resolved when the expected favicon retrieval behavior is clearly established.