Per the previous proposal - Blacky spawned an illegal crate a while ago, and used it to create an Acid Pool. A few days later I pushed someone into it, without having combed through the GNDT history to make sure it was a legal Pool, earning Blacky and myself a Frag. Clearly I’d have spent my AP doing something else if I’d realised that the Pool wasn’t there (and would have played slightly differently since then if I knew I had less of a lead). And other players would have done different things as a result of that death not occurring - Kitty wouldn’t have respawned the next day to pick up their own Acid Barrel, for a start.
Allowing the gained Frags to stay and simply declaring the Crate to be legal seems like the cleanest and fairest solution; anything else seems like a glum precedent to set (giving a big incentive to make small, illegal gamestate updates, then call them out weeks later - even during a DoV - when it can be shown to invalidate someone’s critical action). I think we probably just need an “any game action more than a week old is considered legal” blanket (possibly with an “intentionally invalidating the gamestate is frowned upon” fair play rule to rule out any blatant “lol, actually I gave you some extra points illegally, six days ago” DoV kills), but won’t bundle that up with this fix.