`CoreWebView2Frame.ExecuteScriptAsync` doesn't seem to do anything

Description
Trying to run JavaScript within an <iframe> using CoreWebView2Frame.ExecuteScriptAsync() doesn't seem to do anything.

Version
SDK: 1.0.1466-prerelease
Runtime: 107.0.1418.26 (but probably doesn't matter for this issue)
Framework: WPF (but probably doesn't matter for this issue)
OS: Win11 (but probably doesn't matter for this issue)

Repro Steps
git clone https://github.com/MicrosoftEdge/WebView2Samples.git then apply the below patch and compile and run the WebView2WpfBrowser VS solution:

diff --git a/SampleApps/WebView2WpfBrowser/MainWindow.xaml.cs b/SampleApps/WebView2WpfBrowser/MainWindow.xaml.cs
index e0a9084..c9ac47e 100644
--- a/SampleApps/WebView2WpfBrowser/MainWindow.xaml.cs
+++ b/SampleApps/WebView2WpfBrowser/MainWindow.xaml.cs
@@ -120,6 +120,7 @@ namespace WebView2WpfBrowser
         IReadOnlyList<CoreWebView2ProcessInfo> _processList = new List<CoreWebView2ProcessInfo>();

         public CoreWebView2CreationProperties CreationProperties { get; set; } = null;
+        private WebView2 _webView;

         public MainWindow()
         {
@@ -142,6 +143,7 @@ namespace WebView2WpfBrowser

         void AttachControlEventHandlers(WebView2 control)
         {
+            _webView = control;
             // <NavigationStarting>
             control.NavigationStarting += WebView_NavigationStarting;
             // </NavigationStarting>
@@ -1608,6 +1610,12 @@ namespace WebView2WpfBrowser
         {
             _isNavigating = true;
             RequeryCommands();
+            _webView.ExecuteScriptAsync("window.debugTopLevelProp = 42");
+            _webView.CoreWebView2.FrameCreated += async (object sender1, CoreWebView2FrameCreatedEventArgs args) =>
+            {
+                await args.Frame.ExecuteScriptAsync("alert('this alert is within the frame')");
+                await args.Frame.ExecuteScriptAsync("window.debugFrameProp = 42");
+            };
         }

         void WebView_NavigationCompleted(object sender, CoreWebView2NavigationCompletedEventArgs e)
@@ -1668,7 +1676,7 @@ namespace WebView2WpfBrowser

         private string GetStartPageUri(CoreWebView2 webView2)
         {
-            string uri = "https://appassets.example/AppStartPage.html";
+            string uri = "https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe";
             if (webView2 == null)
             {
                 return uri;
diff --git a/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj b/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
index 2ea3c5b..5ef2cde 100644
--- a/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
+++ b/SampleApps/WebView2WpfBrowser/WebView2WpfBrowser.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFrameworks>netcoreapp3.0;net462</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.0;net472</TargetFrameworks>
     <UseWPF>true</UseWPF>
     <Authors>Hybrid Application Team</Authors>
     <Company>Microsoft</Company>
@@ -40,7 +40,7 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.1414-prerelease" />
+    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.1466-prerelease" />
        <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 </Project>
\ No newline at end of file

I would expect a popup message with this alert is within the frame show up, and using the JS Console in the browser Dev Tools, I would expect window.debugFrameProp to exist within every <iframe>, but in this case, the only thing that exists is window.debugTopLevelProp, at the top level context.

NOTE: I also tried adding an args.Frame.NavigationStarting event handler, but CoreWebView2Frame.ExecuteScriptAsync() also didn't seem to do anything in there.