External link is removed when editing a comment and adding an image to it

Summary

Under a specific test case, the external link in the comment is being removed. See the attached video and steps to reproduce for the detailed test case.

Steps to Reproduce

1. Add a comment with an external link to a previous comment.
2. Edit your comment, and prepend it with a text and the picture.
3. On save, the external link to the previous comment is removed.

Expected Results

Link stays.

Actual Results

Link evaporates.

Workaround

Have to re-link the comment again after the save.