query parameter no longer matches hidden field values

Hi Typeform team,

We're experiencing an issue with the /responses API. We used to query for hidden field values (e.g., ?query=abc123) and receive matching responses where "hidden": { "field_name": "abc123" } — this worked fine until a few days ago.

Now, the same query returns no results, even though we can see the hidden field present in the response payloads.

Could you confirm whether hidden field search support was changed, deprecated, or broken?

Thanks!