Empty response each API request?

Empty response each API request?

I have the world's most boring KB-powered agent with (1) start, (2) utterance capture, (3) KB w/ prompt

I dispatch the following the curl:
API_KEY='{api_key}'

USER_ID='user_123'
USER_INPUT='Hello world!'

curl --request POST "https://general-runtime.voiceflow.com/state/user/$USER_ID/interact" \
     --header "Authorization: $API_KEY" \
     --header 'Content-Type: application/json' \
     --data "{
          \"action\": {
               \"type\": \"text\",
               \"payload\": \"$USER_INPUT\"
          }
     }"


The 1st api call (just text payload) gets a response and subsequent request is an empty array then after that sending same request results in a response

I'm a bit confused with this behavior-- any ideas on a path forward?
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