Build error depending on room-compiler version

Android Programming (4th Edition) 11. Databases and the Room Library
1

If I use the room-compiler version that’s listed in the book

kapt 'androidx.room:room-compiler:2.1.0-alpha04'

then everything works fine. However, if I follow the warning and upgrade to the newer version

kapt 'androidx.room:room-compiler:2.2.0-rc01'

then I receive the following build error:

criminalintentbnr4k/database/CrimeDatabase_Impl.java:7: error: cannot find symbol
import androidx.room.RoomOpenHelper.ValidationResult;
                                   ^
  symbol:   class ValidationResult
  location: class RoomOpenHelper

Obviously the newer version is not final, but any insight what would have changed to make the ValidationResult class be relocated?