Yup, that was the case for me.
My next hurdle is that I cannot get my resolution to change from 1024x768 after doing a GPU passthrough. I'm stuck at that resolution even though my config.plist file for clover shows 1920x1080.
I am suspecting its because my mobo BIOS has onboard graphics. Even though it's set to onboard in BIOS, its still stuck at that low resolution in Mojave Display settings and in VNC/unraid.