The Polymarket resolution for June 19th and 20th markets being 'No' already confirmed no military action occurred on those days, regardless of what happened later.
A strike on the 21st can't reach back in time to cause something not to have happened previously; that’s just a failure of logic.
It's a bit like saying my bus was late yesterday because the one today broke down; the past outcome is fixed by its own conditions.
One must understand the timeframe mandate for these markets, otherwise, the whole system becomes unreliable.