It's a charitable reading to suggest that the later military strikes on June 21st somehow triggered the "No outcome" resolution for the Polymarket prediction markets covering June 19th and 20th.
However, this overlooks the fundamental mechanism of how these markets actually close; each market has its own defined resolution criteria and timeline.
The June 19th and 20th markets resolved as "No outcome" simply because no military action occurred on those specific dates.
Think of it like a job application deadline: if you didn't submit your CV by Friday, the application is already closed, regardless of whether a perfect role opens up next Monday for someone else.