DRM Prime Video not working

I'm using OpenCore 0.6.0 with SMBios 19,1 on a Sapphire Vega 56, i7 9700K and Asus Z390 Prime A. After reading the Fixing DRM section in Dortania I set shikigva=80 and Netflix worked just fine on Safari. For Amazon prime I can play/pause but only get audio with a black background.

Is that common? Is there a fix for it? I did some research but all I could find was how to fix DRM issues (tackling Netflix and Prime video together) for different hardware combinations.

submitted by /u/Alternative_Fly_1905
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