After update to ACF 4.4.0 from 4.2.2. the relationship field started showing the list of wrong custom post type (events instead of pricing packages). I’ve noticed in the list of changes that a similar bug was listed as fixed in the previous version, but I’m still seeing it in 4.4.0, so it might have been re-introduced.
To debug it I’ve added a filter to ‘acf/fields/relationship/query/name=coupon_packages’ and when I dump $args I can see that the post type is correctly set to “pricing”, but the ajax call returns the wrong custom post type “events” instead. In 4.2.2 this was all working correctly.
Dump of $args from acf/fields/relationship/query filter: