Custom Linux Icons Not Showing in OpenCore Boot Picker (UKI Entries)

[Chana]

Setup:

• OpenCore 1.0.2 (or whatever your version is)
• Theme: Acidanthera/GoldenGate
• Multi-boot: macOS + CachyOS + OmarchyOS (both Linux distros using UKI boot)
• PickerMode: External
• PickerAttributes: 145
• PickerVariant: Acidanthera/GoldenGate

Problem: Custom icons for my Linux boot entries won't display - they show generic drive icons instead. macOS entries show correct custom icons.

Boot entries detected by OpenCore:

• "CachyOS" → /EFI/CachyOS/cachyos_latest.efi (on separate EFI partition)
• "OmarchyOS" → /EFI/Omarchy/omarchy_latest.efi (on separate EFI partition)

What I've tried:

1. Created icons in /EFI/OC/Resources/Image/Acidanthera/GoldenGate/ with multiple naming variations:
   • CachyOS.icns, cachyos.icns, cachyos_latest.icns, CachyOS (UKI latest).icns
   • OmarchyOS.icns, omarchy.icns, omarchy_latest.icns, omarchy_fallback.icns
   • Linux.icns (as fallback)
2. Verified .contentFlavour file exists in GoldenGate folder (it was missing - I created it)
3. Placed .icns files next to the actual bootloaders:
   • /EFI/CachyOS/cachyos_latest.efi.icns
   • /EFI/Omarchy/omarchy_latest.efi.icns
4. Verified EFI partition volume labels match icon names (CachyOS, OmarchyOS)
5. All icon files are valid Mac OS X icon format (verified with file command)

Still showing generic drive icons for both Linux entries after all this.

Has anyone successfully gotten custom icons working for UKI-based Linux boot entries? Is there something specific about UKI entries that prevents custom icon matching? Any config.plist settings I'm missing?

Boot_Picker.zip