[2020] Battle pass mission just resets when I finish it

Hey @HugeIntellect. 

That mission actually has multiple steps you need to complete to get the Battle Pass level. Those diamonds on that mission represent how many steps you need to complete. When you complete one of them it will update to the next step and fill in one of the diamonds.

You're on the last step, so once you get those 4 knockdowns you should get the level. 

/Kent