I figured it would resize, but the minimum size has indeed jumped bigger. It also has a positioning bug. Place the miniplayer at the bottom of your screen, then turn on the "show next" option. It gets taller. Turn off "show next", it returns to previous size and position. So far so good.
However, if you do the same thing (on/off) with "show large artwork" it gets bigger as expected. But while it shrinks back when you turn artwork off, it shrinks the wrong way, leaving it well off the bottom of the screen.