Expandable text in issue description is broken
Summary
Expandable text in issues descriptions is not rendered correctly. It shows raw MarkDown source code instead of formatted text. See the screenshot below.
Steps to reproduce
Example Project
See https://gitlab.com/gitlab-org/gitlab-ee
What is the current bug behavior?
When the collapsed text gets expanded, it shows raw MarkDown text.
What is the expected correct behavior?
It it show rendered MarkDown.
Relevant logs and/or screenshots
Output of checks
This bug happens on GitLab.com.
Possible fixes
(If you can, link to the line of code that might be responsible for the problem)