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Reporting this as bug because it's not consistent, but also it really should work differently so feel free to move this into the suggestion category instead.
As it is ticket comments get out of control in SmarterTrack because they show not only under the Comment tab, but also in the Communication tab (they really shouldn't show under the Communication tab at all)
But to add to the existing duplication issue..
When a ticket number is added to another ticket as a "Related Item", one of the tickets shows all the notes that were on the other ticket (as well as that ticket's existing notes).
The reason I'm reporting this as a bug is that most of the time from what I've seen, only ONE of the related tickets has all the notes. The other has just it's own original notes. So that is kind of odd, if your intention is for them to share all notes when they are related tickets, then this isn't' working correctly as only one ticket has all the notes.
But really this is a huge mess as some notes pertain to one of the specific tickets and it is really confusing to have all the notes show in either ticket, this should be scrapped entirely and each ticket should maintain it's own notes.
Maybe just "sticky" notes or something should be shared across related notes.