Mojave reinstall, stuck on reinstall

After having an stable running OpenCore 0.6.1 based Mojave 10.14.4 install running for several months, I made the mistake of applying an Apple security update; I couldn't boot after that. I updated OpenCore to 0.6.7, but mistakenly thought it didn't work.

So I built a fresh OpenCore 0.6.7 USB installer of Mojave 10.14.6. after booting from the USB, I selected to reinstall over my existing installation. And, after reboot, I selected "Install macOS" from the OpenCore menu and waited though the 35 min installation. After the reboot, I booted macOS only to be presented with the macOS Reinstall macOS screen, again. Selecting this goes through the same cycle, starting macOS runs the (re)installer (I've gone through this cycle several times). This cycle all happens, now, without the USB being used.

I have not been able to find out about others' experiences of reinstalling macOS using Opencore. What am I doing wrong? How do I get of of this reinstall loop?Note, the recovery option still lists 10.14.4.