500 error when you click the help icon in Suggested Reviewers and then don’t assign any reviewer

Summary

Error displayed in UI when clicking within Suggested Reviewers box (on the tooltip) and then clicking out of it which triggers a save of the reviewers. Also the tooltip doesn't seem to link to the help page.

Steps to reproduce

1. Open any MR with suggested reviewers and does not currently have any reviewers assigned
2. Edit Reviewers
3. click tool tip (?)
4. Click out of reviewers

Example Project

any MR with suggested reviewers and does not currently have any reviewers assigned

What is the current bug behavior?

500 error

What is the expected correct behavior?

Nothing

Relevant logs and/or screenshots

Request payload: {"merge_request":{"reviewer_ids":[null],"suggested_reviewer_ids":[]}}

Request URL: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105989.json?serializer=sidebar_extras Request Method: PUT Status Code: 500

unknown attribute 'suggested_reviewer_ids' for MergeRequest.
app/services/issuable_base_service.rb:293:in `update',
app/services/merge_requests/base_service.rb:114:in `update',
app/services/merge_requests/update_service.rb:94:in `general_fallback',
ee/app/services/ee/merge_requests/update_service.rb:18:in `general_fallback',
app/services/merge_requests/update_service.rb:18:in `execute',
app/controllers/projects/merge_requests_controller.rb:273:in `update',
ee/lib/gitlab/ip_address_state.rb:10:in `with',
ee/app/controllers/ee/application_controller.rb:46:in `set_current_ip_address',
app/controllers/application_controller.rb:537:in `set_current_admin',
lib/gitlab/session.rb:11:in `with_session',
app/controllers/application_controller.rb:528:in `set_session_storage'

suggested_rev

Results of GitLab environment info

gitlab.com next