Issue comment edit was lost

Summary

I added https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2554#note_36534077 , then made an edit to the note comments (adding a checklist of conflict paths to resolve). I pressed submit, but the update didn't seem to happen and the changes to the comment are lost.

Steps to reproduce

The only odd thing I can see is that an award emoji was issued at about the same time. Perhaps this caused to the problem?

What is the current bug behavior?

Comment change is lost

What is the expected correct behavior?

Comment change should not be lost

Possible fixes

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