I'm having the same problem with

<InputFile OnChange="LoadFile" />

My handler

private async Task LoadFile(InputFileChangeEventArgs e)
{
    throw new Exception();
}

is not throwing anything.

I also tried a "synchronous" handler which is not working either :

private void LoadFile(InputFileChangeEventArgs e)
{
    throw new Exception();
}

I want the exception to be handled by an ErrorBoundary but the one from the InputFile never gets there when the exception thrown by the Button clic does...