Current behavior 🐛

Using Uno SDK version 6.4.0-dev.50.
Webview2 is not able to load the mapped urls and returns a ERR_NAME_NOT_RESOLVED.
It seems this is due to EnsureCoreWebView2Async not really completing the initialization of view. In fact given this code:

await MyWebView.EnsureCoreWebView2Async();
//await Task.Delay(1000);
var folder = Path.Combine(AppContext.BaseDirectory, "Assets");
MyWebView.CoreWebView2.SetVirtualHostNameToFolderMapping(
"appassets.local",
folder,
CoreWebView2HostResourceAccessKind.Allow);

MyWebView.Source = new Uri("https://appassets.local/testpage.html");

The webview loads correctly when uncommeting the one second delay while it doesn't work otherwise.

Expected behavior 🎯

Webview loads correctly

How to reproduce it (as minimally and precisely as possible) 🔬

Use webview2 with the sdk version in the description. Map a folder and load a page from the mapped folder.

Workaround 🛠️

NA

Renderer 🎨

• Skia
• Native

Affected platforms 📱💻🖥️

Windows

Uno.Sdk version (and other relevant versions) 📦

6.4.0-dev.50.

IDE version 🧑‍💻

Microsoft Visual Studio Enterprise 2022 (2) (64 bit) - Current
Version 17.14.18 (October 2025)

Anything else we need to know? 💬

Found Edge WebView2 version 141.0.3537.99