Does aria consider separate collections?

[TheMetrifiedMe]

I am getting wrong results by asking to summarize items from a collection. The results seem to refer to a different collection:

The prompt:
"According to ^included (484 items), what are the five most important research areas"

The way the results are put seems to be fine (five topics and example references). But none of the references are part of the "^included (484 items)" collection. The major topics should also be very different.

Could there be an error in the API call using <userOrGroupPrefix>/items instead of <userOrGroupPrefix>/collections/<collectionKey>/items ? Or is my prompt bogus?

Thank you for help!