Transparent backgrounds of game icons are rendered black

[KczBen]

Your system information

• Steam client version (build number or date): 1738026274, date Tue, Jan 28 12:50 AM UTC -08:00
• Distribution (e.g. Ubuntu): Debian Sid
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: AMD

Please describe your issue in as much detail as possible:

Game icons that have transparent sections show black in the transparent areas, instead of the Steam client's background colour. This is inconsistent with Windows, where transparent sections are indeed transparent on the library page. The issue seems to affect every part of the client where the game icons are used: Library, Friends, Community. It makes small icons harder to tell apart at a glance, since they all become various black squares instead of their intended unique shapes.

I've attached an example of the current behaviour in the Linux client, and also a screenshot of the same icon on the desktop.

Steam library entry:

Desktop icon:

Steps for reproducing this issue:

1. Add any game to your library that has an icon with transparent parts (e.g. War Thunder, Blender, Counter-Strike: Source, VRChat)
2. The icon is black where it should be transparent