Vanilla USB install -- Clover boots from the USB drive, but does not show me any bootable Apple images.... If I boot from the Hackintosh HDD with the USB stick plunged in - Clover *does* show me the boot image on the USB drive and I can boot from it. What am I missing?

So I am following the Vanilla USB install. I am using a Catalina install (Install MacOS Catalina.app). When I got to the part where it says "You now have a bootable USB that will boot in a MAC", I tested on my Mac mini -- and YES, it booted on my Mac mini. So far, so good!

So then I followed the next step and used Clover to put a EFI bootloader on the USB stick. I put some minimal KEXT's into the EFI folder (including FakeSMC). When I try to boot my machine with the USB stick -- the Clover interface appears, but there is no bootable image to select!?!?

At one point, I put the USB stick in my Hackintosh and booted Clover from my HDD.... the Clover interface shows me the MacOS Catalina image on the USB stick, and lets me boot from it?!?

What am I missing? Why doesn't the Clover on the USB stick see the bootable image, while the Clover on the Hackintosh HDD does?