QA failure in `qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb:19` | Create Create a new merge request creates a basic merge request

Summary

The Reviewer section of the MR side widget never finishes loading. It spins forever, preventing the merge request page from loading completely.

Steps to reproduce:

1. Visit the merge requests page for a project
2. Open an MR
3. As you can see in the screenshot, Reviewer always has the loading spinner.

Failing smoke test in staging:

• https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/1872271
• https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/1872518

Failing specs in master (specs are failing because they rely on MR show page to finish loading):

• https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/743406927
• https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/743406924
• https://gitlab.com/gitlab-org/gitlab-qa-mirror/-/jobs/743406911

Stack trace

 1) Create Create a new merge request creates a basic merge request
     Failure/Error: expect(merge_request).to have_description(merge_request_description)
     
     QA::Support::Repeater::WaitExceededError:
       Wait condition not met after 60 seconds
     # ./qa/support/repeater.rb:44:in `repeat_until'
     # ./qa/support/waiter.rb:23:in `wait_until'
     # ./qa/support/wait_for_requests.rb:11:in `wait_for_requests'
     # ./qa/page/base.rb:181:in `has_element?'
     # ./qa/support/page/logging.rb:98:in `has_element?'
     # ./qa/page/merge_request/show.rb:179:in `has_description?'
     # ./qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb:28:in `block (4 levels) in <module:QA>'
     # ./qa/scenario/actable.rb:16:in `perform'
     # ./qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb:26:in `block (3 levels) in <module:QA>'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # ./spec/spec_helper.rb:70:in `block (2 levels) in <top (required)>'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
     # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:37:in `block (2 levels) in setup'
     # ./qa/specs/runner.rb:71:in `perform'
     # ./qa/scenario/template.rb:10:in `block in perform'
     # ./qa/scenario/template.rb:8:in `tap'
     # ./qa/scenario/template.rb:8:in `perform'
     # ./qa/scenario/template.rb:35:in `perform'
     # ./qa/scenario/template.rb:10:in `block in perform'
     # ./qa/scenario/template.rb:8:in `tap'
     # ./qa/scenario/template.rb:8:in `perform'
     # ./qa/scenario/bootable.rb:28:in `launch!'

Screenshot / HTML page

create_create_a_new_merge_request_creates_a_basic_merge_request.html

Possible fixes