I know this is a minor issue that has existed for a long time and only appears when there are multiple bards in your party (which only exists in Duty Finder settings) who aren’t playing the same songs, but I honestly have no idea what the buff icon changing between songs achieves. From my understanding it does not mean the buff type changes depending on what the icon is. Only one of them is actually active. Unless I’m wrong and it actually does change which is probably worse.

And yes, it is not a big deal. But if you look at this footage provided by the internet, you can see it interacting with the Wanderer’s Minuet bug too.

I think either making same songs stack and different songs not stack, or giving a buff for partywide buff and a buff for your own effects might solve the issue of the game constantly checking which song is active.