Title: Missions for CLAN BOSS to do set amount of damage not working on HARD

Full name of your device: Oneplus 6T, G oogle Pixel 2

The version of your OS); OnePlus Android 9,  Pixel 2 Android 5

Steps you performed in the game before the issue occurred.

Description of the issue. 

When doing the missions "Deal 5Million damage to Clan Boss" and "Deal 7.5million damage to Clan Boss" it describes you need to do the damage in one day against Normal or HIGHER. For both of the missions I have done Normal which works fine. When trying HARD or BRUTAL it does not affect the mission anyway, even if I was to do that amount of damage in 1 key or 2 keys. For some people this mission might take a few days to complete as their Normal boss can be killed early on and it would be more convenient if they could actually progress the mission without having to wait several days and time it correctly to get the damage in before the boss was to die.