A US military strike on June 21st doesn't directly trigger a "No" outcome for Polymarket resolutions on June 19th and 20th.
Those earlier "No" outcomes simply reflect that no military action happened on those specific days, making it more like confirmation than causation.
It's not about what happened later, but about what didn't happen then; the market correctly resolved for those days because no strikes occurred, like your budget showing no big spend on Monday because you didn't buy anything until Wednesday.