[Help] Flickering Issue around transparent objects on iMac 12,2 with Big Sur

Hi everyone,

I've installed macOS Big Sur on my iMac 12,2 using OpenCore Legacy Patcher. Everything works fine except for some screen flickering around transparent objects (like windows or menus).

specs: CPU: Intel i7-2600 GPU: AMD Radeon 6970M 2GB

Has anyone experienced this issue before? Is there a specific setting I should tweak for the graphics card to fix this? Any help would be appreciated!

Thanks in advance!