Yeah, happening on my Mac now, and on my phone. It's just that little speech-bubble icon that shows up twice. Once over-top of the start of the thread title, then again at the end of the thread title. You could just get rid of it all together? Since the thread titles are bold when unread, that's really all the notification I need? Alternatively, what about making the thread titles go a different colour (Light Blue, Bolded for the NZ theme) when un-read then back to white when read? Eh, maybe not Blue... Grey? Dunno... Whatever is least distracting.
The little "speech bubble" icon seems a bit redundant, basically.