Believing a later military strike could retroactively trigger a 'No outcome' on earlier prediction markets wastes precious mental resources.
The markets for June 19th and 20th resolved as 'No' because literally nothing happened during that specific, finite window.
The later strike on June 21st couldn't possibly go back and confirm an absence of activity; that's like saying getting a job offer today confirms all the applications you didn't send last week.
Time and market conditions are dwindling resources, they don't flow backward to validate past non-events; each period has its own separate outcome.
For example, if you bet on rain on Tuesday, and it rained on Thursday, your Tuesday bet still lost.