As Tier2 support engineer has already said, a further discussion with a QA team is needed in order to find out if QA team can assign an engineer to reproduce the described behaviour. Without that done we can not know for sure if the issue is Veeam related or Hyper-V related, or both, therefore placing a KB article is not possible at the moment. You ticket is still opened and, in the last line of their latest email, support has asked you to perform one more test. Kindly, keep working with your support engineer.
Thank you for your patience.