Wow that is some quick support! Thank you very much, the icons indeed looks sharp at 125% now. And I didn't even provide dedicated 125% variants yet. So I assume you downscale the 150 or 200 variants as of now. Nice!
However, some bugs were introduced. The preview inside the SkinCreator appears fine, but once saved and opened in MusicBee itself, these bugs appear. From what I can see, it affects the main player controls panel, where most of the custom icons no longer respect their on/off states; plus sizing issues where some button states don't respect the 125% setting but scale down to a 100% version. PlayPause button is showing Pause state only. Volume slider is kinda broken. Love button (in not-loved state) is replaced by Banned button.