Missionreward balancing based on time effort

October 10th 2018, about five weeks after it was implemented.

Update 2.2.2 Patch Notes (Stonehenge)

  • This also fixes an issue where the bonus tier for completing 3 waves was incorrectly awarding too soon, making it seem like there was no bonus loot at that tier

Edit: But CrimsonRabbit could be including nerfs in TSW as past crimes too.