The military strike on June 21st doesn't automatically mean nothing happened earlier on the 19th or 20th to influence those markets; that's not how precedent works.
Historically, prediction markets operate on information streams that change constantly, not just a single future event.
Think of it like this: if you bet on rain by Tuesday, and it only rains on Saturday, that Saturday rain doesn't erase all the cloud formations and forecasts that might have kept your hopes alive until then.
What if there were earlier unconfirmed reports of activity that kept the 'Yes' options from fully collapsing before the 21st?
The playbook has long shown that market resolutions are often more complex than a simple 'later event confirms earlier void'.