Update to Catalina 10.15.5 broke my onboard graphic (black screen) / I5 9600K / Gigabyte Z390M

Hello,

I recently built a working Hackintosh, I had a lot of help from the german Hackintosh Forum. It was really a bit fricky with the graphics. However, it worked perfectly, until now for the update to 10.15.5. Unfortunately, I now get a black screen. It does not matter whether HDMI, DVI or DP. Currently I use DP.

My hardware:

• Gigabyte Z390M Motherboard
• Intel I5 9600K CPU
• Intel UHD 630 with device id: 0x3E98

Bootloader is OpenCore 0.5.8 with WhateverGreen, Lilu, VirtualSMC ... (It's all up to date.)

My current working OC config within 10.15.4:

OC Config 10.15.4

My bios settings: https://www.hackintosh-forum.de/forum/thread/47969-intel-uhd-graphics-630-7-mb-2-monitore/?postID=593977#post593977 ("Eingeschaltet" is "ON"; "Ausgeschaltet" is "OFF")

This issue seems related: https://github.com/acidanthera/bugtracker/issues/938
But for example https://github.com/acidanthera/bugtracker/issues/938#issuecomment-636070348 doesnt work for me.

May someone have an idea? Thanks in advance