Chrome Version: 55.0.2883.87 (Official Build) (64-bit)
OS: Linux

What steps will reproduce the problem?
(1)Have more than 1 comments in an issue
(2)Try to reply to an earlier comment and the reply is lost. It is neither shown in the UI nor an email is sent for it.
(3)

What is the expected result?
Reply should be shown in UI and an email should be sent.

What happens instead?
 It is neither shown in the UI nor an email is sent for it.

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For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.