NoClassDefFound -- new class cannot access the class whose classloader was used for injection

In a nutshell, I have a class B$1 that I create from scatch at runtime and that has a non-static method calling a static method of class B$0 (there is no inheritance between the two classes, although they may share the parent, but even that's not a necessity).

Injection is done by

Class b0 = Class.forName("B$0");
ClassLoadingStrategy.Default.INJECTION.load(b0.getClassLoader(),
        Collections.singletonMap(newClass.getTypeDescription(), finishedBytecode));

but if I immediately after that injection test the method

try {
    Class c = Class.forName("B$1");
    Object instance = c.newInstance();
    c.getMethod("move", Object.class).invoke(instance, new Object());
} catch (Exception e) {
    e.printStackTrace();
}

I get a NoClassDefFoundError: B$0.

Why? And how do I resolve this?

(For more details about the use case, please see https://stackoverflow.com/questions/49232664/how-to-load-this-class-in-the-correct-way .)

Oh, and if at all relevant: using Java 1.7.0_65 and ByteBuddy 1.7.9