We have a bug in this mission that we won 10 diamonds by completing the 7 mission of the day. The bug is to do two missions that are consecutive and take the two at the same time, but you have to be clicking several times to get it, so it will count several times and you can get the 10 diamonds without finishing the rest of the mission.
https://photos.app.goo.gl/buF4Iw1tJ6MPOfEj1