blazor-net5-wasm-focusout

Refer to:

• dotnet/aspnetcore#26809
• dotnet/aspnetcore#26838

Steps to reproduce

1. Set the TestNet5Wasm.Server as a startup project.
2. Run the app (Ctrl + F5)
3. On the Index.razor page, click on item 1

Expected:

No error is thrown

Actual:

An error is thrown

Uncaught (in promise) Error: Assertion failed - heap is currently locked at y (blazor.webassembly.js:1) at Object.beginInvokeDotNetFromJS (blazor.webassembly.js:1)

Using a @onfocusout handler does not solve the issue (click on item 2 to reproduce) as it rhows with another error:

Error: System.ArgumentException: There is no event handler associated with this event. EventId: '3'. (Parameter 'eventHandlerId'

IMPORTANT: The issue is not reproducible with the 3.1 version - use the same steps to reproduce as the above with the TestNet31Wasm app.