Can only boot to Recovery after switching from Clover to OpenCore

I am trying to switch from Clover r5120 to OpenCore 0.7.2 on my machine running Catalina 10.15.6 (since I am having trouble upgrading to Big Sur under Clover and the upgrade thread suggests that OpenCore will work better).

I followed the guide at https://dortania.github.io/OpenCore-Install-Guide/ including the section on Clover conversion (https://dortania.github.io/OpenCore-Install-Guide/clover-conversion/).

The OpenCore boot menu looks like this:

OpenCore Boot Menu...

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Author: kohenkatz