How can we consume messages from one extension in another extension

[Suhail-Ismail]

We have two independent extensions, lets say Extension A and Extension B. Our idea was to reference the messages dll from extension A in the extension B and execute the request. But this is not working as expected when we are using Self hosted CSU, but works well in cloud hosted. The request handler will correctly be selected correctly but the if condition which matches the type in execute method never returns true. I can see the messages file is loaded twice in the modules when debugging. Is this a bug or indented behaviour?