Feedback module: Teacher with capability mod/feedback:createpublictemplate is still unable to create public template

An admin can create a public template of feedback questions but when a course teacher tries to do the same, the tick box for 'public' does not appear. Earlier versions of moodle had mod/feedback:createpublictemplate capability 'not set' for the teacher system role. In moodle 2.4 this appears to be set to 'allow' by default but the 'public' tick box still does not appear for a teacher in a course.