Hi! I wasn't sure if I should open an issue on the GitHub about this or not, but I've been trying to set a custom background image that has transparency, and it's transparency has been filled with white or sometimes black, instead of having a transparent background.
An example of an image that doesn't work:

Clearly whatever strawberry uses to display images in the background supports transparency, given 'A Taste of Strawbs' and the default background image both have functional transparency (although the former looks very strange with on dark themes).

I'm on Debian 12 (bookworm) using GNOME (43.9) and I'm using the latest tagged release for my distribution (strawberry_1.2.11-bookworm_amd64) from the GitHub release page.

Lemme know if I just need to mess with the image more (maybe it needs a specific pixelformat or something to work correctly?), give more information, and/or if I should just open a GitHub issue on this.