core_completion_get_activities_completion_status is not returning the status correctly for teachers

As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Enable completion tracking in Site administration > Advanced features Create a new course with the option "Enable completion tracking" set to yes Create a new page, set " Completion tracking" to "Students can manually mark the activity as completed" Enrol a user in the course as teacher Using the Moodle Mobile app access the course as the teacher Mark the activity manually as completed (clicking on the empty box) Check that the activity is marked (you see a tick inside the box)