Not getting sets for jsp:useBean bean when in request scope

I have a JSF (JSP) page in which I have a bean that I declare using jsp:useBean.
The bean implements Map. I have a h:inputText and an h:inputHidden with a value referencing the bean.
The odd thing is that if in jsp:useBean, I set the scope to session, everything works as I expect. However, if I change the scope to request, the put method on the bean never gets called.
Can anyone explain why this is happening?
Thanks,
ken clark

Yes, I understand that old data I had is gone -- that is fine, I expect that.
My question is, why do I not get calls on the put method of my Map implementation when the screen is submitted? (I have a breakpoint in the method in the debugger, so I know when I get hit.)
If the scope is session, I get put calls (yes, the old data is there, it gets overwritten).
If the scope is request though, I simply never see the calls made at all, and my application errors out for lack of data.

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