Interesting, never even knew this was a bug as a I always started from fresh. Good luck on your runs
Completing the mission is also "optional", as you can end the operation with a "Pointless Sacrifice" (dying without completing main objective) and still be given a results page including time. Shorter means less room for optimization, which means times are going to be maxed pretty quickly, making categories stale. Forcing players to have all members extract can make for more exciting runs when it comes to larger missions, allowing different strategies like splitting off or 4-manning objectives among others. I also believe this change will help leaderboard longevity as it will take much longer to max times as stated before. This is my 2 cents as a long-time runner and moderator. Please let me know your thoughts
I'll look into this sometime next week and make the necessary changes