Covered by a phpunit test.   In case you're interested on testing it manually, you can follow these steps: Add several tags, for example in your Profile > Edit profile > Interests Create course within any category Create two book resources within the course and add tags to each of them in their create/edit chapter form page (the first page you see when you create a new book) > Tags section Backup the course Import the course, for example as a new course within the same category Access your instance database and read the table tag_instance, verify that the ordering column starts from 1 when the component, itemtype, itemid columns change (this is if you have a fresh installation; otherwise, check that after installing the patch, the ordering field is increasing the value depending on the itemid). For example: the user tags have to have an ordering 1, 2, 3... The first book tags with ordering 1, 2, 3... and the other book tags with ordering 1, 2, 3... and so on.