After some research, trackers documentation suggests:
What can I do if a problem remains, despite the tracker issue being closed as fixed?
If you find that a bug is still affecting a stable version of Moodle, despite the tracker issue being closed as fixed, please do as follows:
- Create a new issue for the bug
- Go back to the closed issue and link it to the issue you've just created. This will generate an email notification to all watchers, so they know to watch, vote or comment on the new issue from then on.
The new issue is MDL-66860.
Hope I have done everything right.