No. If a student's work is 'not validated', they can go back to drafting and revise it, try again (there's no cap on attempts), or send it to you anyway.
The student decides when to send. You see the attempt they sent, including each answer and how each dimension contributed to the result.
A 'not validated' result isn't a finding of misconduct. It means the submission is below the Validity Threshold you set, and it may be worth a closer look. Validate doesn't grade work or decide misconduct. That decision stays with you.