"Release" filter causes an error on the issue search page

Summary

Selecting the Release filter causes a An error occurred fetching the dropdown data. error message to be shown:

Steps to reproduce

1. Navigate to https://gitlab.com/groups/gitlab-org/-/issues
2. In the search box, select the "Release" filter, and then select "="
3. The page will show an error message near the top of the screen as shown in the screenshot above

Output of checks

This bug happens on GitLab.com.

Possible causes

In the "Network" tab in the browser's dev tools, a request is being made to https://gitlab.com/groups/gitlab-org/-/.json when the "Release" filter is selected. This is not a real URL and is returning a 404. This is likely because this filter is being used on the group issues page, not the project issues page.