gemini-omni-flash-preview: previous_interaction_id not supported on Agent Platform route but works on Gemini API route

[higherlevilan]

Environment:

• API: REST (curl)
• Model: gemini-omni-flash-preview

Expected behavior:
Both routes support previous_interaction_id for stateful video editing.

Actual behavior:

• generativelanguage.googleapis.com/v1beta/interactions → works
• aiplatform.googleapis.com/v1beta1/projects/{PROJECT}/locations/global/interactions → returns error

Error response on Agent Platform route:
{
"error": {
"message": "gemini-omni-flash-preview on this path do not support previous_interaction_id.",
"code": "invalid_request"
}
}

Reproduction (Agent Platform route - fails):
curl -sS -X POST
"https://aiplatform.googleapis.com/v1beta1/projects/{PROJECT}/locations/global/interactions"
-H "Authorization: Bearer $(gcloud auth print-access-token)"
-H "Content-Type: application/json"
-d '{
"model": "gemini-omni-flash-preview",
"previous_interaction_id": "{valid_id_from_previous_interaction}",
"input": "Make the violin invisible.",
"store": true
}'

Reproduction (Gemini API route - works):
curl -sS -X POST
"https://generativelanguage.googleapis.com/v1beta/interactions?key=$API_KEY"
-H "Content-Type: application/json"
-d '{
"model": "gemini-omni-flash-preview",
"previous_interaction_id": "{valid_id}",
"input": "Make the violin invisible."
}'

Question:
Is previous_interaction_id intentionally not supported on the Agent Platform
route for this model? If so, please update the documentation to clarify.

[Venkaiahbabuneelam]

Hi @higherlevilan, Thanks for reaching out us!

We have successfully reproduced the issue and will file an internal bug.

Thanks