Solved
Updated to STM32CubeIDE Version: 2.1.1 and now my project properties say they are not a CDT project.
I upgraded to STM32CubeIDE Version: 2.1.1 and imported my existing projects as STM32. I opened Project / Properties / C/C++ Build and it says "This is not a CDT project." I've never seen that before using version 1.18.1. What happened and how can I fix it?