[] Compile error when implement interface on .NET/Android

// Compile error: (E0) Internal error: Object reference not set to an instance of an object.
public class TestClass : TestInterface{
    public void DoSth(){
        // This method with case-sensitive name won't produce error before 8.3

    public void doSth(){

public interface TestInterface{
    void doSth();

Thanks, logged as bugs://73762

bugs://73762 got closed with status fixed.