Issue using Blackmagic UltraStudio Mini Monitor

Hello, I have a running hackintosh under macOS Big Sur with open core 0.6.4. Almost everything is working fine, but I have a small problem when using the ultrastudio mini monitor to get a clean video feed to my reference monitor with resolve for colorgrading. After a fresh boot green artifacts are appearing on the reference monitor screen. To solve this I have to unplug and replug the mini monitor while the computer is still on and then restart the computer. After that it works fine, but everytime I shut down my computer (without using restart), when booting up again it doesn't work again. And so on.
Does anyone have an idea how to solve this issue ?

Config :

Gigabyte Z490 Vision D
Intel i9 10850K
Gigabyte RX 5700 XT OC

submitted by /u/Adridulte
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