Adding any new c++ class causes compile error in Engine code

Development Programming & Scripting
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5

All C++ classes are added through the editor.

I’m running VS2022 Community 17.7.2 last updated on August 28th. I see 17.7.3 was just released, so I can try that but I’m not expecting a miracle.

My project is split private/public under /source/

Pre-compiled engine, since I haven’t modified it in any way.