Create Confidential Merge Request button missing when issue is confidential

Summary

After creation of a confidential issue, a Create Confidential Merge Request button should appear. This does not seem to occur. I discovered this while trying to work with the GitLab 12.1 Confidential Merge Request feature described here. This is definitely reproducible. This appears to always happen with self-hosted. Whether it happens on gitlab.com appears to be related to whether the project is in a group or not.

FWIW, I saw something similar in, I believe, GitLab 12.0 (before the confidential merge request functionality) that was not immediately reproducible.

Steps to reproduce

Create a confidential issue
The resultant page should display a Create Confidential Merge Request button, but it does not.
Using the right hand navigation bar, edit the issue to turn confidentiality off.
The Create Merge Request button appears.

Example Project

What is the current bug behavior?

Instead of a Create Confidential Merge Request button, nothing appears.

What is the expected correct behavior?

A Create Confidential Merge Request button should be displayed

Relevant logs and/or screenshots

In the image below, no Create Confidential Merge Request button is offered:`

After removing confidentiality, the Create Merge Request button is displayed:

Output of checks

This bug happens on GitLab 12.1.6 - this installation was created with our Helm charts and is running in the GitLab GCP environment:

NAME  	REVISION	UPDATED                 	STATUS  	CHART       	APP VERSION	NAMESPACE
gitlab	13      	Thu Aug 15 12:39:11 2019	DEPLOYED	gitlab-2.1.7	12.1.6     	i2p-demo

For access, contact @xyzzy

Possible fixes

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

Edited Aug 15, 2019 by Reb