Reproduction for issue #318 in the OutSystems repo for WebView use with the WebViewControl-Avalonia nuget package.

UPDATE:

The issue is caused by x64 systems requiring the WebViewControl-Avalonia nuget package while arm64 systems require the WebViewControl-Avalonia-ARM64 package. Both nuget packages can't be used at the same time.

If you are only targeting x64 or arm64 you can use one or the other packages and call it a day. However if you require both you need to update your build configuration to support both x64 and arm64 instead of Any CPU, and then also modify your .csproj so it can handle it like so:

<ItemGroup Condition="'$(Platform)' == 'x64'">
    <PackageReference Include="WebViewControl-Avalonia" Version="3.120.5" />
</ItemGroup>
<ItemGroup Condition="'$(Platform)' == 'arm64'">
    <PackageReference Include="WebViewControl-Avalonia-ARM64" Version="3.120.5" />
</ItemGroup>

Keep in mind while developing if you update one nuget package it won't update the other, nor will it show in our IDE that it needs an update.