VerifyError when accessing variable in static method

The following class and byteman rule work correctly (printing 1):

public class BmTest {
public static void main(String[] args)

{ new BmTest().run(); }

public void run() { int i = 1; i = 2; // line 8 }
}

RULE example
CLASS BmTest
METHOD run()
AT LINE 8
IF TRUE
DO System.out.println($i)
ENDRULE


If the run method is made static, then it results in "Exception in thread "main" java.lang.VerifyError: (class: BmTest, method: run signature: ()V) Register 0 contains wrong type". I'm using java version "1.6.0_20", OpenJDK Runtime Environment (IcedTea6 1.9.7) (fedora-52.1.9.7.fc14-x86_64)

public class BmTest {
public static void main(String[] args) { new BmTest().run(); }

public static void run()

{ int i = 1; i = 2; // line 8 }
}


The slightly more convoluted version which calls the static method from an instance method does work however:

public class BmTest {
public static void main(String[] args) { new BmTest().foo(); }

public static void run() { int i = 1; i = 2; // line 8 }

public void foo()

{ run(); }

}

Calling the static method after an instance method doesn't though:

public class BmTest {
public static void main(String[] args)

{ new BmTest().foo().run(); }

public static void run()

{ int i = 1; i = 2; // line 8 }

public BmTest foo()

{ return this; }

}

I haven't done further testing, but it looks like it fails when the current call stack only contains static methods.