I know its been forever since ive replied to this topic. I actually figured out what the problem was. Austere.J over at TM figured out the issue and created a patch. Which now its deprecated into whatevergreen.kext You just have to add the correct properties into Clover/Devices/Properties for your iGPU.The problem is a kernel panic due to divide-by-zero when injecting the correct properties for your iGPU. Mine being the UHD620. I was using 0x59160000 which is the correct platform-ID.
But until you add the correct properties for "now" dpcd-max-link-rate and enable-dpcd-max-link-rate-fix within your iGPU properties it wont work. Long story short. It works flawless now. Ive attached a copy of my latest Clover with all the properties added.