MDL-80187 introduced the new core_courseformat\local\sectionactions class to group all course section editing (design is explained in MDL-80000).

The method to create a section is now sectionactions::create, inspired by the previous course_create_section global function. However, during the development of MDL-80190, I discovered an error when creating a section zero.

The course_create_section has a $position>0 condition that now prevents the creation of the section zero.