Hi,
I' facing a very weird problem with Wicket 6.13.0. Some stateless forms has stopped to submit their value when we upgraded our app to this version. I tracked down the commit that is responsable for this problem and is the one related to the issue in the object. If I modify the Page class rolling back its changes everything works fine again. Unfortunately creating a quickstart is really hard and I couldn't reproduce the error in a separate project. Debugging the code it turns out that the page with my forms was stateful with Wicket 6.12.0 and now is stateless. Under this conditions, when my form is submitted the condition "if (freshPage && (isStateless == false || component == null))" inside ListenerInterfaceRequestHandler is true and the listener is not invoked. I'm sorry but I don't have any other detail so far to give. I will try to isolate the problem in a quickstart during the weekend.
