Upgrading langchain-openai to >= 0.3.0 causes an error to be thrown when using with_structured_output and ainvoke

[GaryFail]

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Example Code

def get_llm(temperature: float = 0.0):
    return AzureChatOpenAI(
        model=os.environ.get("MODEL_NAME"), temperature=temperature, streaming=True
    )

llm = get_llm(0.5)

class StructuredOutput(BaseModel):
    a: str
    b: str


prompt_template = ChatPromptTemplate.from_messages(
    [("system", "Pick random values and assign to a and b")]
)

runnable = prompt_template | llm.with_structured_output(StructuredOutput)


@observe()
async def strategy_update_agent(state: State):
    response = await runnable.ainvoke({})

    return {
        "messages": AIMessage("done")
    }

Description

After upgrading the langchain-openai package to anything greater than 0.2.14 I receive the error 'AsyncStream' object has no attribute 'aclose' when I call ainvoke on an AzureChatOpenAI instance if I am using structured outputs. If I call invoke it works fine or if I downgrade to 0.2.14 it also works fine.

System Info

Windows

langchain-core==0.3.45
langchain-community==0.3.19
langchain-openai==0.3.0
langfuse==2.55.0
langgraph==0.3.14
langgraph-checkpoint==2.0.21
langgraph-checkpoint-postgres==2.0.18