fromanthropicimportAsyncAnthropicfromopenaiimportAsyncOpenAIfrompydantic_aiimportAgentfrompydantic_ai.messagesimportModelRequest,SystemPromptPart,TextPart,ModelResponse,UserPromptPartfrompydantic_ai.models.anthropicimportAnthropicModelfrompydantic_ai.models.openaiimportOpenAIModelasyncdeftest_anthropic_issue()->None:openai_key=""anthropic_key=""models= [        ("OpenAI",OpenAIModel(model_name="gpt-4o-mini",openai_client=AsyncOpenAI(api_key=openai_key))),        ("Anthropic",AnthropicModel(model_name="claude-3-7-sonnet-latest",anthropic_client=AsyncAnthropic(api_key=anthropic_key))),    ]forname,modelinmodels:print(f"\n\nModel:{name}")agent=Agent(model=model,        )messages= [ModelRequest(parts=[SystemPromptPart("Respond with the user's last message in upper-case")]),# ModelRequest(parts=[UserPromptPart(content="Hello")]), <-- Issue does not happen if uncommentedModelResponse(parts=[TextPart(content="HELLO")]),        ]awaitagent.run(user_prompt="Test",message_history=messages,result_type=str,        )