I think they did do this prior to the channel merge, on big 80's. Then, it went away when it turned to 80's on 8. I think.
Don't quote me on that.
It's new to the 80s on 8 (at least the Sirius XM verision). It might have a lot to do with the fact that they seem to be playing ONLY the Sirius songs again (and sadly, very few of them...they need to bring back specialty shows that play rarer tracks OR just bring back the larger playlist. It was the only good thing to come of the changes and they changed it back!