Unreal Engine 4.25 released!

I have the same issue and also send a report to Epic. I found a workaround for this. You must do click to File -> Refresh Visual Studio Project and Intellisense will work again. The reason is because when Unreal Engine editor add a new C++ class, the file entry doesn’t has the include header with some #define values, like UBT_COMPILED_PLATFORM. When you do “Refresh Visual Studio Project”, the project file is fixed with correct paths. This is a “fast” solution while Epic releases a fix for this.

Sorry for my english.