Custom field values in course overview block follow incorrect order

Setup

1. Login as an admin
2. Navigate to "Site administration -> Courses > Course custom fields"
3. Click on "Add a new category"
4. Click on "Add a new custom field" and select in the dropdown the "Dropdown menu" option
5. Fill out the "Name" as "Semester" (General)
6. Fill out the "Short name as "semester" (General)
7. Fill out the "Menu options" (Dropdown menu field settings) as following:
   Autumn term 2011/12
   Spring term 2012
   Autumn term 2012/13
   Spring term 2013
   Autumn term 2013/14
   Spring term 2014
   Autumn term 2014/15
   Spring term 2015
   Autumn term 2015/16
   Spring term 2016
   Autumn term 2016/17
   Spring term 2017
   Autumn term 2017/18
   Spring term 2018
   Autumn term 2018/19
   Spring term 2019
   Autumn term 2019/20
   Spring term 2020
   Autumn term 2020/21
   Spring term 2021
8. Click on "Save changes".
9. Navigate to "Site administration >Plugins > Blocks > Course overview"
10. Allow under the "Available filters" the "Custom field" (displaygroupingcustomfield) and selectin the "Field to use" (customfiltergrouping) the "Semester".
11. Click on "Save changes".
12. Navigate to "Site administration >Courses > Add a new course"
13. Create several courses and enrol a user to this course (repeating step 12):
    • with "Semester" set to "Spring term 2020"
    • with "Semester" set to "Autumn term 2019/20"
    • with "Semester" set to "Spring term 2012"

Standard (regression) test

1. Login as the enrolled user
2. Navigate to the "Dashboard"
3. Navigate to the "Course overview" block or add one if the block is not present
4. Click on the filter of the "Categories"
5. Verify the "Autumn term 2019/20" option is first and "No semester" is last

Fixed functionality test

• Login as the enrolled user
• Navigate to the "Dashboard"
• Navigate to the "Course overview" block or add one if the block is not present
• Click on the filter of the "Categories"
• Verify the "Spring term 2012" option is first and "No semester" is last