Sending session ids over text doesn't seem to return the session back

[lithafnium]

Hey there, I'm sending input as text with a "custom_session_id" as part of the payload, like such:

data = json.dumps(
            {"text": prompt, "type": "user_input", "custom_session_id": "testtestest"}
        )

When I read the messages back, however, I'm not getting the custom_session_id in the json object. Any idea as to what could be the issue?