Of course, to go to a "copy of the page", instead of returning to the same page, solves the problem to assign the score I want.
It's not a confortable thing, because there is not a "duplicate page" command, so I need to copy and paste a lot of time.
We have really a good luck because we have free moodle e we can in some way do what we want do, even if not ever in a confortable way.
Nevertheless, I think the module, here, has a very silly behavior.
Lesson
wrong way to grade answer
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