Can't get HDMI to work properly on Xiaomi Notebook Pro 2020 (Comet Lake)

Hello everyone,

I've successfully installed OpenCore 0.6.4 and BigSur on my Xiaomi Notebook Pro 2020. Everything is working perfectly apart from the HDMI port:

Whenever I connect my external display, my internal display sets itself to 30 Hz (practically unusable) while the external display works perfectly. Also, whenever i unplug the HDMI, the internal display shows a black screen and it won't fix itself unless I force reboot the computer.

I also checked my config.plist and couldn't find anything wrong (port set to HDMI and not DP etc.)

Here's my CONFIG.PLIST (note: repo is not updated to OC 0.6.4 and kexts are not updated, though locally everything is up-to date)

Specs if needed:

i7 10510U

Intel UHD 620 + MX 350 (Disabled).

Thanks to everyone! :)