[Risolto] ACF Options for a Relationship field doesn't work as expected when using "copy"

Background of the issue:
I am trying to access a relationship options field in the second language on my site link nascosto while it is set to copy using WPML.

Symptoms:
The relationship options field returns null when accessed in the second language.

Questions:
I want to use an options field with relationship set to copy.

The options field is a relationship of a Service CPT that is translated.

When in the 2nd language I'd expect to either get the array of primary language ids OR the array of copied 2nd language ids... however I get null...