"Jump to next unresolved discussion" button disappears when starting a review

Summary

The "Jump to next unresolved discussion" button is no longer visible after leaving a new command and pressing the "Add to review" button.

Steps to reproduce

1. Navigate to the "Changes" tab of a merge request

2. Start a review, leave two inline comments, finish the review. You should now be in a state like:

   

3. Start a reply to the first comment and click on the "Add to review" button.

4. Note how the "Jump to next unresolved discussion" button is now missing.

   

Example Project

Nearly any project will do.

What is the current bug behavior?

The "Jump to next unresolved discussion" is missing, forcing the user to manually search for the next unresolved discussion to address.

What is the expected correct behavior?

The "Jump to next unresolved discussion" should remain visible.

Relevant logs and/or screenshots

See above.

Output of checks

This bug happens on GitLab.com

(If you can, link to the line of code that might be responsible for the problem)