@Pete-S Ok, I went ahead and let the installer partition it using the defaults for LVM. Everything is working!
The installer creates a small primary partition and installs /boot to it. It then creates an extended partition with the remainder of the drive and slices up logicals out of that for the LVM. It puts “/“ in vg1 as “lv root” and puts /swap in vg1 as well as lv swap”.
I was not creating a /boot. Never have. I was just creating a primary for the “/“ and then saving some of it for an extended /swap. I’ve done this forever. It even works in a VM. I have no idea why I couldn’t get it to work on the physical machine.