Gallery is not showing up in Rest API of custom post type

Hi There!

First of all: Amazing plugin! Very helpful, when working on no-budget websites where ACF Pro is not an option.

Currently I have an issue with the rest api. For whatever reason I can see default acf fields in my GET request of a custom post type, but the photo_gallery field is missing completely. I can see that the IDs of the images selected on a test post are written to the database, but they won’t be shown in the rest api (/wp-json/wp/v2/reference) where reference is the name of my custom post type.