Bug or wrong documentation: Responses api vector_store_ids array limited to one

[dpiret1]

According to the documentation, the file_search tool of the Responses API admits several vector store ids:

vector_store_ids array Required
The IDs of the vector stores to search.

But adding more than one throws an error:

"Invalid 'tools[0].vector_store_ids': array too long. 
Expected an array with maximum length 1, but got an array with length 2 instead."

Is this something to be fixed by Open AI?

[f10w]

It’s documented:

[dpiret1]

True. Not in the API reference, unfortunately. And both are contradicting.
Anyway, I hope they allow searching in more than one vector store, as it seems to be the plan.