I cannot know what the bugfix will come, however we must be ready to encouter critical bugs in the future.
Lets think about how long time it tskes to test 5 heroes teams battle. Combinatorial 5 from 108 is about 1.11e10^8.
Assuming one battle test takes 1 second, (1.11e10^8 X 1.11e10^8)/(2 x 3600 x 24)=abou 7.1e10^10 days needed to test. Impossible, even if PerBlue do effectively with the world greatest wisdom. This difficulty goes up as more characters appear.
Its better to prepare precaution unpredictable behaviour of the game in the future because players spend their time.