I'd like to add myself to Icons don't scale when decreasing the panel size as finding the current behavior dissatisfying.
As you can see the icons from indicators are HUGE and furthermore I suspect this is the cause of the way my panel themes are being broken at the top.
I changed wallpaper to help draw attention to the issue. Note that it only occurs on the top panel, also there seems to be an issue with the clock applet not recognizing that a panel wallpaper has been applied.
I almost added this post to the linked thread but I didn't want to get accused to derailing so I started a new one. If the mods feel that the two issues are in fact related (I think they may be) then please feel free to move this post to that thread.