The Project Modules field group is now acf-json/group_anspm_project_modules.json, loaded by core's existing load_json filter alongside the other twelve groups, and editable in Field Groups. The PHP acf_add_local_field_group() registration is removed; this file now owns renderers only. Group key, field key and field name are unchanged, so module content already saved on any page still resolves. Group description corrected - it named a plugin retired in 1.9.0 and stated a design intent that has since reversed.