ElementReference.FocusAsync(true) does not seem to be registered

[anddrzejb]

Describe the bug
When calling await element.FocusAsync(true), it seems that bUnit does not register it. When event is called, code never resumes. Currently the only workaround is to register the event manually like this:

    JSInterop.SetupVoid("Blazor._internal.domWrapper.focus", _ => true).SetVoidResult();

Version info:

• bUnit version: 1.2.49
• .NET Runtime and Blazor version: net 6 rc1
• OS type and version: windows 10