Android class loading reflection issue

I'm trying to use reflection to execute a specific method from a class from another package. And this works OK for the following scenario:

• I install the target package and run my app, works ok.
• I un-install the target package and install a different version of the same package it also works fine when I run it from my app.

If I don't uninstall target, but I just drag over apk with a different code in the emulator (same target package), my app executes code from the previous version, but if I would run that other app, I see it's a proper version (code\functionality) installed, how is that possible???

Obviously, I'm missing something, but this is what I have at the moment behind my app button click:

//...
Context packageContext = createPackageContext("com.some.package", Context.CONTEXT_INCLUDE_CODE + Context.CONTEXT_IGNORE_SECURITY);
Class<?> otherPackageClass = packageContext.getClassLoader().loadClass("com.some.package.SomeClassName");
Method someMethod = otherPackageClass.getDeclaredMethod("someMethod");
//...

(com.some.package is from that other app)

My guess is that it must be something related to this getClassLoader or createPackageContext, but not sure what.

Is it cached maybe somehow and if yes, how to force it to always use the last installed version?

I also tried looking for something like hot reloading for android reflection etc. but I couldn't find anything that could help me solve this problem.