Playground displays blank page for ChatBedrock based chain with configurable_filed temperature

[bbiletskyy]

The playground shows the blank page for ChatBedrock based chain with configurable_field for llm temperature. The playground works fine without the configurable_field. Setting the temperature via the swagger WebUI works fine.

Setup: langchain-aws==0.2.9 langserve==0.3.0

class JokeRequest(BaseModel):
    topic: str

llm = ChatBedrockConverse(
    model_id="meta.llama3-8b-instruct-v1:0",  # "amazon.titan-text-express-v1" gives the same result
    temperature=0.0,
).configurable_fields(temperature=ConfigurableField(
        id="llm_temperature",
        name="LLM Temperature",
        description="The temperature of the LLM",
    )
)

add_routes(
    app,
    PromptTemplate.from_template("Tell me a joke about {topic}") | llm | StrOutputParser(),
    path="/joke",
    input_type=JokeRequest,
    output_type=str,
)

Also tried this with the same result

...
llm = ChatBedrock(
         model_id="meta.llama3-8b-instruct-v1:0",
         model_kwargs=dict(temperature=0.0),
         beta_use_converse_api=True, # False gives the same result
     ).configurable_fields(temperature=ConfigurableField(
         id="llm_temperature",
         name="LLM Temperature",
         description="The temperature of the LLM",
     )
 )
 ...