Pro Forms: ACF field with dynamic data / Calculated Field


I have a Pro Forms with a query loop dropdown select where the value return the post ID, this is working fine.

Based on the youtube video for the “Ingredient Calculator”, I have created a calculation field to retrieve the post_id of the dropdown selected, this is working fine, when I select a post, the calculation field is updated.

Then I try to display an ACF field based on the Post ID, it’s working when I manually insert the post ID, but doesn’t work if I take the calculation field (from the selected dropdown).

Have I missed something or is it simply not possible ?

Thanks and Regards,