Hi
i created this post, and now after using N11 and melodyne for few weeks, i assure it was a “user” error.
(see my previous response for the reason)
now when i assign melodyne with ARA on events, i do some actions in nuendo before editing in melodyne,like drawing 3 part in audio track, so when i do undo accidentally in nuendo and not in melodyne, it does undo on those last created “parts” and not undo the assignment of the ARA extension,which deletes all the edited data made in melodyne ,without the option to redo it again 
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