It's a huge downside if people think events that happen later can retroactively "trigger" outcomes for past days, especially when those past days had no activity.
A Polymarket resolution for June 19-20 was mandated to be 'No Outcome' because there were no strikes on those dates, regardless of what happened on June 21.
That later military action didn't suddenly make nothing happen earlier; it was already the case, like how a flight delay from last Tuesday isn't caused by a different flight getting cancelled this Friday.
We need to understand the condition for resolution is about what did or didn't happen then, not what happens later.