Something went wrong while fetching Epics

Summary

When viewing epics on the roadmap at groups/my_group_name/-/roadmap, the page will produce an error that says "Something went wrong while fetching epics" when attempting to scroll the page. This happens on multiple groups for the same user. Interestingly, it seems to be replicated in only Chrome (Version 89.0.4389.90 (Official Build) (64-bit) but it does not happen in Firefox (Version 87.0 (64-bit))

Would be interested in developer feedback if further debugging is needed.

Steps to reproduce

Not able to replicate outside of a specific customer example

  1. Go to a group or subgroup
  2. Go to Epics > Roadmaps
  3. Try to scroll the page

Example Project

Please see ZD Ticket with attached .har

What is the current bug behavior?

Scrolling/navigating on the Epics > Roadmap page shows a "Something went wrong while fetching Epics" error without any indicate on why it's unable to load.

What is the expected correct behavior?

A user should be able to load Epics > Roadmap or know why epics are unable to be loaded

Relevant logs and/or screenshots

Output of checks

This happens on GitLab.com 13.11.0-pre ef1acea7

Results of GitLab environment info

Expand for output related to GitLab environment info 

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

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 by Cleveland Bledsoe Jr