Big Sur: everything seems fine except desktop background

For some background pictures, the right side seems to be garbled (see attached screenshot). But some pictures seem to be fine. If I open those pictures under /System/Library/Desktop Pictures with Preview, they are also correctly displayed.

I have not observed anything else out of order. But it's kinda weird. I didn't have this issue on previous versions. I've been running Hackintosh on this machine since 2016.

Any ideas what's going on or should I be worried? Thanks.

Spec: Gigabyte Z170MX Gaming 5, Skylake 6700K, GeForce GT730 dGPU, OpenCore 0.6.6, Big Sur 11.2.2

submitted by /u/delingren
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