.Net: Bug: Semantic Kernel prompt template is not working for Agents

[KSemenenko]

Describe the bug
We try to use templats and acccording to this codumention https://learn.microsoft.com/en-us/semantic-kernel/frameworks/agent/agent-templates?pivots=programming-language-csharp it shoud work.

but in our case it doesent'

To Reproduce
We just use this

// Initialize a Kernel with a chat-completion service
Kernel kernel = ...;

ChatCompletionAgent agent =
    new()
    {
        Kernel = kernel,
        Name = "StoryTeller",
        Instructions = "Tell a story about {{$topic}} that is {{$length}} sentences long.",
        Arguments = new KernelArguments()
        {
            { "topic", "Dog" },
            { "length", "3" },
        }
    };

and result was like properties are not setted. model ask to provide topic and length

Expected behavior
it shoud works

Platform

• OS: [Windows]
• IDE: [Visual Studio, Rider]
• Language: [C#]
• Source: [e.g. NuGet package version 0.1.0, pip package version 0.1.0, main branch of repository]
• Microsoft.SemanticKernel Version="1.32.0"
  SemanticKernel.Assistants Version="1.31.2"

Additional context