The 1.0 spec says in 6.7.4:

If the propagated conversation cannot be restored, the container must associate the request with a new transient conversation and throw an exception of type javax.enterprise.context.NonexistentConversationException from the restore
view phase of the JSF lifecycle. The application may handle this exception using the JSF ExceptionHandler.

1.1 and 1.2 just say:

If the propagated conversation cannot be restored, the container must associate the request with a new transient conversation and
throw an exception of type javax.enterprise.context.NonexistentConversationException.

Yet the javadoc of NonexistentConversationException for both 1.1 and 1.2 says:

If the propagated conversation cannot be restored, the container must associate the request with a new transient conversation and throw an exception of type NonexistentConversationException from the restore view phase of the JSF lifecycle.

So is it supposed to be thrown from restore view or not? I assume not. Probably javadoc should be amended.
I'm curious about reasoning behind the change. I tried searching for an explanation but didn't find anything.