Microsoft.SemanticKernel.HttpOperationException when using MistralAIChatCompletionService

[TRybina132]

Describe the bug
I'm using latest version 1.5.0 of mistral connector for semantic kernel and methods GetStreamingChatMessageContentsAsync, GetChatMessageContentAsync from MistralAIChatCompletionService
I receive this exception(in previous version there was no exception):

Microsoft.SemanticKernel.HttpOperationException: Unprocessable Entity
---> System.Net.Http.HttpRequestException: Exception of type 'System.Net.Http.HttpRequestException' was thrown.
--- End of inner exception stack trace ---
at Microsoft.SemanticKernel.Connectors.Mistral.MistralClientCore.CallMistralAuthedAsync(String url, StringContent content)
at Microsoft.SemanticKernel.Connectors.Mistral.MistralClientCore.CallMistralChatEndpointAsync(ChatHistory chat, MistralPromptExecutionSettings textExecutionSettings)
at Microsoft.SemanticKernel.Connectors.Mistral.MistralClientCore.GetChatMessageContentsAsync(ChatHistory chat, PromptExecutionSettings executionSettings, Kernel kernel, CancellationToken cancellationToken)
at Microsoft.SemanticKernel.ChatCompletion.ChatCompletionServiceExtensions.GetChatMessageContentAsync(IChatCompletionService chatCompletionService, ChatHistory chatHistory, PromptExecutionSettings executionSettings, Kernel kernel, CancellationToken cancellationToken)

What can it be?

To Reproduce
Here is bug reproduction repository: https://github.com/TRybina132/MistralConnectorBug

Expected behavior
No exception is thrown and method returns result.

Platform

• OS: Windows, Mac
• Language: C#
• Source: NuGet package version 1.5.0