"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)
issue