'copy_metadata' quick action not functioning when defined in description

Summary

Including the /copy_metadata quick action in an issue or merge request description field does not result in the metadata being copied from the defined issue when 'Submit' is pressed.

Steps to reproduce

Create a new issue or merge request and attempt to use the /copy_metadata quick action for an issue.

What is the current bug behavior?

No metadata is copied from the referenced issue.

What is the expected correct behavior?

See Quick actions

Output of checks

This bug happens on GitLab.com