How are the comment bubbles supposed to work?

Discussion created by 6707265 on Apr 18, 2014
Latest reply on Apr 5, 2015 by Yuval Pecht
Whenever a new comment is made to an incident it is supposed to be filled blue bubble, correct?  After going into the incident and viewing it, and then returning to your tickets, shouldn't it be marked as "read" or "non-filled" bubble instead of still having a filled bubble?

Maybe I'm missing something?