Window Buttons with multi-monitor setup doesn't show display's app buttons correctly
I've checked out the other multi-mon bugs re: window buttons, but this is different (it's not resolved by re-checking the relevant options or fixed by those fixes - it just never works correctly).
I have two monitors on a single NVidia card. Monitors are the same model.
On both displays I have a panel with Window Buttons set to display only each display's windows.
The first monitor shows all apps no matter what - I can change settings all day long, I can't get that to change behavior. If I add a new instance of Window Buttons to that panel or another new panel on that display, same exact behavior.
Second monitor only shows windows of which the middle has moved past the middle of the display onto the left side. (You'll have to parse that sentence, but it's accurate :) If I add a new instance of Window Buttons to that panel or another new panel on that display, same exact behavior.
I'm not using xRandR or anything, just the xfce display manager.
I'm using Xubuntu 21.04, everything is up to date. This was the same in previous versions for me on a completely different computer - this one is an all-new hardware and install. It's weird that I can't find anyone else reporting, so I wonder if it's something I'm doing???