STM32WB55 example won't compile after minor CUBEMX modification

I would like to run the STM32WB55 BLE_TransparentMode on my custom application board, but first I need to re-assign the pins used for LPUART1. However, any code generation from CubeMX, even without making any modifications, causes hundreds of compiler errors including "multiple definition of main". In fact, every function has the error that there is a duplicate definition. I have tried cleaning the build, but I get the same problem. Shouldn't I be able to generate code from the example's CubeMX .ioc file that compiles? Is there some setting or method I can change to be able to make simple modifications to this example?