Change a method call to another one

Hi, having the following structure compiled into class files:

public class A {
  public void A_method() { ... };
}

public class B extends A {
  public static void static_B_method() { ... };
}

public class C {
  static A static_A_instance;
  ...

  public void method() {
    static_A_instance.Amethod();
  }

  ...
}

I need to replace at class C the static_A_instance.Amethod() to
B.static_B_method()

I wrote some code that at visitMethodInsn will generate the call to
B.static_B_method() but the stack operand gets corrupted because there still a
GETSTATIC of static_A_instance just before the code injected by my
visitMethodInsn.

The resulting .class file looks like this:
....
getstatic C.static_A_instance : A
invokestatic B.static_B_method() : void
....

How can i solve this problem?

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