Indeed, I can see how the dynamic colors may cause trouble. In this case, it is only when the "Martial You Colors" are disabled that the problem shows up. Combined with the "Less rounded" "Rounded Corners" option, all of the buttons are blank [likely, they're black on black, which looks the same as blank to our feeble human eyes. ;)].
Apologies for not being clearer. I should have shown two screenshots of the settings and made sure to indicate which went with which screenshot of the Play UI.
In the screenshots above, the settings image corresponds to first shot, where the buttons have a dark blue background and off-white/light blue foreground. The second screenshot, where the buttons are blank, is with the "Material You Colors" option disabled. Hopefully that makes it a bit less challenging to reproduce.
The potential for bad contrast and/or colors with Material You colors system-wide is one reason why I use "basic colors" in wallpaper settings and chose "disabled" in Poweramp.
As a test, I did enable "dynamic colors" in the system wallpaper settings. Poweramp worked just as well as "basic colors" at the system level and "Material You Colors" are enabled in the skin settings.
If you still want a screenshot of the wallpaper settings, just let me know.
Thanks!