Issue could have been closed by a mis-click, an AI bot gone wrong, a misunderstanding of the issue etc. You can't assert it was deliberate unless e.g. you work in the team that handled it and have inside knowledge. Agree GOS should have benefit of the doubt (too)

your logic would assert a similar conclusion with this scenario:

a person walks up to you, punches you in the face, and leaves.

it could have been an accident, an AI bot, or a misunderstanding. definitely not deliberate.