That’s a bug in kapt and it’s reported here. Actually the java code you posted is a stub class which generated by kapt to run annotation processors on it (as you can see, there is no real implementation, just the structure and annotations). So as a workaround you can move the code with @Parcelize annotations to a separate module where you don’t have kapt enabled. kotlin-parcelize itself does not use annotation processors to generate code, it uses a compiler plugin to emit the IR directly I believe.
Update: the issue is fixed in kotlin 1.5