HDMI unstable MacOS Big Sur

I have a Lenovo Yoga 13IKB and I successfully booted Big Sur on it.

I also have an external display that is connected through HDMI with an external usbc dock (Lenovo thought it was a genius idea to not have any video outputs) I am running on the UHD620 that came with i7-8550U. While HDMI does work (144hz with my display, I can scale the display & stuff in settings on big sur) but for some reason the signal keeps on cutting out, usually when a refresh of the image is needed (when brining up right click menu, opening launchpad, switching pages on chrome, etc)

The hub and cable is perfectly fine and works on windows so it seems that it is an iGPU issue. I have the device ids configured with platform-id 0000c087 device-id 16590000 with framebuffer patched accordingly, and using MacbookPro14,1 smbios.

Any ideas on why this is happening?

Thanks