.Net: PromptRendered event does not use changed RenderedPrompt

[dviry]

When attaching the PromptRendered event to the kernel (in order to avoid going over the token limits), the updated .RenderedPrompt is not taken into consideration (i.e. I still get a context_length_exceeded error).

Here is a sample event handler:

private void Kernel_PromptRendered(object? sender, Microsoft.SemanticKernel.Events.PromptRenderedEventArgs e)
{
    var tokenEncoding = GptEncoding.GetEncodingForModel(options.CurrentValue.ChatCompletionModelId);  // usually "cl100k_base"
    var encoded = tokenEncoding.Encode(e.RenderedPrompt);
    if (encoded.Count > options.CurrentValue.MaxTokenTotal)
    {
        e.RenderedPrompt = tokenEncoding.Decode(encoded.GetRange(0, options.CurrentValue.MaxTokenTotal));
    }
}

This applies to the C# SemanticKernel 1.0.0-rc3.