Failure in browser_ui/2_plan/issue/mentions_spec.rb | Plan mention mentions another user in an issue

Full description

Plan mention mentions another user in an issue

File path

./qa/specs/features/browser_ui/2_plan/issue/mentions_spec.rb

Stack trace

Failure/Error: expect(show).to have_link(at_username)
  expected to find link "@gitlab-qa-user1" but there were no matches

First happened in https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/1037308387.

Screenshot

plan_mention_mentions_another_user_in_an_issue.html

User appears as @undefined