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Bug with roadmaps where epics show up twice in the UI

Summary

Link to live example is here:

https://gitlab.com/groups/gitlab-org/-/roadmap?state=opened&sort=end_date_asc&milestone_title=13.8&label_name%5B%5D=devops%3A%3Aplan&layout=MONTHS

Steps to reproduce

Navigate to this or any filtered roadmap
I have not tested without filters because of performance issues with the whole list of issues loading

What is the current bug behavior?

What is the expected correct behavior?

No dupes in the list

Output of checks

This bug happens on GitLab.com

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

Edited Jan 06, 2021 by Christen Dybenko