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Nested collection in a collection page doesn't work

Hi! I wanted to follow this tutorial on nested collections:

Except I would like to create this not in a collection list but in a collection page and it doesn’t seem to work as I expected.

Let me explain: I have a “products” collection from which I created all my product pages. I created a new collection for some technical specifications related to some products. Then for each product I created a reference field pointing to some specifications. But when I create a collection list in my collection page linked to these specifications it shows me ALL the specifications of the collection and not those indicated in the reference field of the product. The two collections are not nested, not linked.

Anyone know if indeed this is impossible in a collection page or if I missed something?

Thank you!