I used the API to generate a summary of a YouTube video with a Custom Prompt, but in some cases the result is clearly different from what I specified.

My guess is that if another user has already summarized the same video, the API may be returning that existing summary instead.

When this happened, the summary was returned immediately in the API response, rather than later through the webhook notification.

Is this expected behavior or a bug?

Is there any way to avoid this issue and ensure that the specified Custom Prompt is applied?