How to display data stared in a ACF Post Object inside a repeater?

I thought this was a bug, but apparently I messed up, so I’m moving it here.

Here’s the original post: NO BUG: Strange results when using fallback values for an ACF repeater

Basically, I have an ACF repeater with a post object field and a few text/image fields.

If those text image fields are empty, I want to fill them on the outside with the contents of the correspoinding fields in post object as a fallback.

Concrete example: if I have the Testuppdrag post object, and the “puff-image” field is empty, then the query should display the featured image from the Testuppdrag object.

However, when I put a query targeting the post-object repeater field inside the main query, the post-object query dies. I can put a different query inside the main query just fine, but the post object query returns nothing, not even a block wrapper.

TIA!