I have resolved the problem for Publish-Over-FTP (I'm sure, the solution for Publish-Over-SSH is the same).
You have to override the method readResolve() in all inherited classes, for Publish-Over-FTP this are:
The reason is, that the reflection-mechanism looks for the method readResolve() in the inherited class (see above) and after this in the base-class. The reflection-invoke of the method fails, if the method is declared in the base-class and call over the derived class.
Can I check in the patched classes on GitHub?